public static void main ( String [ ] args ) {
  FastScanner input = new FastScanner ( ) ;
  String s = input . next ( ) ;
  int k = input . nextInt ( ) ;
  int count = 0 ;
  for ( int i = s . length ( ) - 1 ;
  i >= 0 ;
  i -- ) {
    if ( s . charAt ( i ) == '0' ) {
      count ++ ;
    }
    if ( count == k ) {
      System . out . println ( ( s . length ( ) - ( i ) ) - count ) ;
      return ;
    }
  }
  if ( count < k ) {
    System . out . println ( s . length ( ) - 1 ) ;
  }
}

public static void main ( String [ ] args ) { FastScanner input = new FastScanner ( ) ; String s = input . next ( ) ; int k = input . nextInt ( ) ; int count = 0 ; for ( int i = s . length ( ) - 1 ; i >= 0 ; i -- ) { if ( s . charAt ( i ) == '0' ) { count ++ ; } if ( count == k ) { System . out . println ( ( s . length ( ) - ( i ) ) - count ) ; return ; } } if ( count < k ) { System . out . println ( s . length ( ) - 1 ) ; } }
(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)))) (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: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (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: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) 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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (expression_statement (update_expression (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (parenthesized_expression (identifier)))) right: (identifier))))) (return_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))))))))