#include<bits/stdc++.h>
using namespace std;
int main(){
	string s1;
	cin>>s1;
	char c1,c2;
	cin>>c1>>c2;
	for(int i=0;i<s1.size();i++){
		if(s1[i]==c1){
			cout<<c2;
		}
		cout<<s1[i];
	}
	return 0;
}

/**************************************************************
	Problem: 1570
	User: zhenghaoxuan
	Language: C++
	Result: Wrong Answer
****************************************************************/