public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  String a = scanner . nextLine ( ) ;
  scanner . close ( ) ;
  String smaller = "-1" ;
  if ( a . length ( ) != 1 ) {
    smaller = a . substring ( 0 , a . length ( ) - 1 ) ;
  }
  else {
    if ( ! a . equals ( "a" ) ) {
      ArrayList < String > alphabets = new ArrayList < String > ( ) ;
      int alphaSize = 'z' - 'a' ;
      char alpha = 'a' ;
      for ( int i = 0 ;
      i <= alphaSize ;
      i ++ ) {
        alphabets . add ( String . valueOf ( alpha ) ) ;
        alpha ++ ;
      }
      int index = alphabets . indexOf ( a ) - 1 ;
      smaller = alphabets . get ( index ) ;
    }
  }
  System . out . println ( smaller ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; String a = scanner . nextLine ( ) ; scanner . close ( ) ; String smaller = " - 1" ; if ( a . length ( ) != 1 ) { smaller = a . substring ( 0 , a . length ( ) - 1 ) ; } else { if ( ! a . equals ( " a " ) ) { ArrayList < String > alphabets = new ArrayList < String > ( ) ; int alphaSize = ' z ' - ' a ' ; char alpha = ' a ' ; for ( int i = 0 ; i <= alphaSize ; i ++ ) { alphabets . add ( String . valueOf ( alpha ) ) ; alpha ++ ; } int index = alphabets . indexOf ( a ) - 1 ; smaller = alphabets . get ( index ) ; } } System . out . println ( smaller ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))))))) alternative: (block (if_statement condition: (parenthesized_expression (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) consequence: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (character_literal) right: (character_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (character_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 (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (expression_statement (update_expression (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))