# include<iostream> using namespace std; int main(){ char a[1000],n1,n2; cin>>a>>n1>>n2; int b=0; while(a[b]!='\0') b++; for(int i=0;i<b;i++){ if(a[i]==n1) a[i]=n2; }for(int i=0;i<b;i++) cout<<a[i]; return 0; }