#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;
		}else{
			cout<<s1[i];
		}
	} 
//	int p=s1.find(c);
//	while(p!=1){
//		s1.erase(p,1);
//		p=s1.find(c,p);
//	}
//	cout<<s1;
	return 0;
}

/**************************************************************
	Problem: 1570
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2076 kb
****************************************************************/