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#include<stdio.h>
int main(void){

    int x,y;
    x='a'-'A';

    char a[6];
    char b[6];
    char c[6];
    scanf("%s",a);
    scanf("%s",b);
    scanf("%s",c);



    int i;
    i=0;
    while(i<5){
        if(a[i]>'Z'){
            a[i]=a[i]-x;
        }
        else{
            b[i]=b[i]-x;
        }
        y=b[i]-a[i];
        if(c[i]>'Z'){
            c[i]=c[i]-x+y;
            if(c[i]>'Z'){
                c[i]=c[i]-('Z'-'A')-1;
            }
            if(c[i]<'A'){
                c[i]=c[i]+('Z'-'A')+1;
            }
        }
        else{
            c[i]=c[i]+x+y;
            if(c[i]>'z'){
                c[i]=c[i]-('Z'-'A')-1;
            }
            if(c[i]<'a'){
                c[i]=c[i]+('Z'-'A')+1;
            }
        }
        printf("%c",c[i]);
        i++;
    }
    printf("\n");
return 0;
}