#include<bits/stdc++.h>
using namespace std;
using u64 = uint_least64_t;
using s64 = int_least64_t;
using ll = uint_least64_t;

int main(){
	string s ;
	cin >> s;

	for (int i = 0; i < s.size(); i++){
		if (s[i] == '4'){
			s[i] = 1;
		}
	}
	cout << s << endl;
	return 0;
}