#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char s[200],A,B; int i=0; cin>>s>>A>>B; while(s[i]!='\0'){ if(s[i]==A) s[i]=B; cout<<s[i]; i++;} return 0; }