#include<bits/stdc++.h>
using namespace std;
int main(){
	string str,a;
	char c;
	cin>>str>>c>>a;
	int p=str.find(c);
	while(p!=-1){
		str.replace(p,1,a);
		p=str.find(c);
	}
	
	cout<<str;

	return 0;
}

/**************************************************************
	Problem: 1570
	User: zhuanghaoxiang
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2076 kb
****************************************************************/