#include<bits/stdc++.h> using namespace std; string a,b,c; int main(){ getline(cin,a); a +=" "; cin>>b>>c; int len= a.size(); string s=""; for (int i = 0 ;i<=len;i++){ if(a[i]!=' ') s+=a[i]; else{ if(s==b)cout<<c; else cout<<s; cout<<a[i]; s=""; } } return 0; }