PERFORM TEST 3 SOL2

#include<stdio.h>
int main()
{
    char ch1,ch2;
    int sum;
    while(1)
    {
        scanf("%c%c",&ch1,&ch2);

        if(ch1=='?' && ch2=='?')
            break;

        sum=((ch1-65)+(ch2-65));
        if(sum>25)

        {
            sum=sum%26;
        }
        printf("%c\n",sum+65);
         getchar();
        }


return 0;
}
#include<stdio.h>
int main()
{
    char ch1,ch2;
    int sum;
    while(1)
    {
        scanf("%c%c",&ch1,&ch2);

        if(ch1=='?' && ch2=='?')
            break;

        sum=((ch1-65)+(ch2-65));
        if(sum>25)

        {
            sum=sum%26;
        }
        printf("%c\n",sum+65);
         getchar();
        }


return 0;
}