#include <iostream>
#include <cstring>

using namespace std;

int main()
{
    char s[251], init[251]="", c1, c2;
    cin>>c1;
    cin>>c2;
    cin.get(s, 250);
    strcpy(s, init);
    for(int i=0; i<strlen(s)-1; i++)
        if(s[i]==c1)
            s[i]==c2;
        else if(s[i]==c2)
            s[i]==c1;
    cout<<init<<endl;
    cout<<s;


}