public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int T = sc . nextInt ( ) ;
  while ( T -- != 0 ) {
    String x = sc . next ( ) ;
    String y = sc . next ( ) ;
    StringBuilder s1 = new StringBuilder ( x ) ;
    StringBuilder s2 = new StringBuilder ( y ) ;
    s1 = s1 . reverse ( ) ;
    s2 = s2 . reverse ( ) ;
    int f = s2 . indexOf ( "1" ) ;
    int l = s1 . indexOf ( "1" , f ) ;
    int k = l - f ;
    System . out . println ( k ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int T = sc . nextInt ( ) ; while ( T -- != 0 ) { String x = sc . next ( ) ; String y = sc . next ( ) ; StringBuilder s1 = new StringBuilder ( x ) ; StringBuilder s2 = new StringBuilder ( y ) ; s1 = s1 . reverse ( ) ; s2 = s2 . reverse ( ) ; int f = s2 . indexOf ( "1" ) ; int l = s1 . indexOf ( "1" , f ) ; int k = l - f ; System . out . println ( k ) ; } }
(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: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))