func_code_string: #include <bits/stdc++.h>   using namespace std;   char to_da(char c) {     if (c >=  A  && c <=  Z )       return c;     else       return c - 32;   }   char to_xiao(char c) {     if (c >=  A  && c <=  Z )       return c + 32;     else       return c;   }   int main() {     string s;     int a;     while (cin >> s >> a) {       int len = s.length();       for (int i = 0; i < len; i++) {         s[i] = to_xiao(s[i]);         if (s[i] < a + 97)           s[i] = to_da(s[i]);         else           s[i] = to_xiao(s[i]);       }       cout << s << endl;     }     return 0;   }   