func_code_string: #include <bits/stdc++.h>   using namespace std;   template <class T>   long long ToInt(const T &x) {     stringstream s;     s << x;     long long r;     s >> r;     return r;   }   template <class T>   string ToString(const T &x) {     stringstream s;     s << x;     return s.str();   }   int main() {     string str, str2;     cin >> str;     if (str.length() == 1) return cout << 1 << endl, 0;     long long N = str[0] -  0 ;     N++;     for (int i = 1; i < str.length(); i++) str2 +=  0 ;     string temp = ToString(N);     str2 = temp + str2;     printf( %lld n , ToInt(str2) - ToInt(str));   }   