public static void main ( String hi [ ] ) throws Exception {
  BufferedReader infile = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  char [ ] arr = infile . readLine ( ) . toCharArray ( ) ;
  char [ ] brr = infile . readLine ( ) . toCharArray ( ) ;
  int N = arr . length ;
  int M = brr . length ;
  if ( N < M || bad ( arr , brr ) ) System . out . println ( "No" ) ;
  else {
    int [ ] left = new int [ N ] ;
    int [ ] right = new int [ N ] ;
    int [ ] place = new int [ 26 ] ;
    Arrays . fill ( place , N + M + M + N ) ;
    int dex = 0 ;
    for ( int i = 0 ;
    i < N ;
    i ++ ) {
      if ( dex < M && arr [ i ] == brr [ dex ] ) {
        left [ i ] = place [ arr [ i ] - 'a' ] = dex ;
        dex ++ ;
      }
      else left [ i ] = place [ arr [ i ] - 'a' ] ;
    }
    dex = M - 1 ;
    place = new int [ 26 ] ;
    Arrays . fill ( place , N + M + M + N ) ;
    for ( int i = N - 1 ;
    i >= 0 ;
    i -- ) {
      if ( dex >= 0 && arr [ i ] == brr [ dex ] ) {
        right [ i ] = place [ arr [ i ] - 'a' ] = dex ;
        dex -- ;
      }
      else right [ i ] = place [ arr [ i ] - 'a' ] ;
    }
    String res = "Yes" ;
    for ( int i = 0 ;
    i < N ;
    i ++ ) if ( right [ i ] > left [ i ] ) res = "No" ;
    System . out . println ( res ) ;
  }
}

public static void main ( String hi [ ] ) throws Exception { BufferedReader infile = new BufferedReader ( new InputStreamReader ( System . in ) ) ; char [ ] arr = infile . readLine ( ) . toCharArray ( ) ; char [ ] brr = infile . readLine ( ) . toCharArray ( ) ; int N = arr . length ; int M = brr . length ; if ( N < M || bad ( arr , brr ) ) System . out . println ( " No " ) ; else { int [ ] left = new int [ N ] ; int [ ] right = new int [ N ] ; int [ ] place = new int [ 26 ] ; Arrays . fill ( place , N + M + M + N ) ; int dex = 0 ; for ( int i = 0 ; i < N ; i ++ ) { if ( dex < M && arr [ i ] == brr [ dex ] ) { left [ i ] = place [ arr [ i ] - ' a ' ] = dex ; dex ++ ; } else left [ i ] = place [ arr [ i ] - ' a ' ] ; } dex = M - 1 ; place = new int [ 26 ] ; Arrays . fill ( place , N + M + M + N ) ; for ( int i = N - 1 ; i >= 0 ; i -- ) { if ( dex >= 0 && arr [ i ] == brr [ dex ] ) { right [ i ] = place [ arr [ i ] - ' a ' ] = dex ; dex -- ; } else right [ i ] = place [ arr [ i ] - ' a ' ] ; } String res = " Yes " ; for ( int i = 0 ; i < N ; i ++ ) if ( right [ i ] > left [ i ] ) res = " No " ; System . out . println ( res ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier))))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (block (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) right: (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) right: (identifier)))) (expression_statement (update_expression (identifier)))) alternative: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) right: (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) right: (identifier)))) (expression_statement (update_expression (identifier)))) alternative: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)))))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier)))) consequence: (expression_statement (assignment_expression left: (identifier) right: (string_literal))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))