#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    char c1,c2;
    cin>>c1>>c2;
	for(int i=0;i<s.size();i++){
		if(s[i]==c1){
			cout<<c2;
		}else{
			cout<<s[i];
		}
	}
	return 0;
}

/**************************************************************
	Problem: 1570
	User: yangjunwenredianling
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2076 kb
****************************************************************/