# include<iostream> # include<cstdio> using namespace std; int main(){ char arr[200]; char A,B; cin>>arr; cin>>A>>B; int n=0,i=0; while(arr[i]!='\0'){ n++; i++; } for(i=0;i<=n;i++){ if(arr[i]==A){ arr[i]=B; } } cout<<arr; return 0; }