#include<stdio.h>
#include<string.h>
 
void main(){
    char a[100];
    char c1,c2;
    int i;
    scanf("%s %c %c",&a,&c1,&c2);
     
    for(i=0;i<strlen(a);i++){
        if(a[i]==c1){
            a[i]=c2;
        }
    }
    printf("%s",a);
}
/**************************************************************
	Problem: 1570
	User: admin
	Language: C
	Result: Accepted
	Time:17 ms
	Memory:1144 kb
****************************************************************/