1048

PAT_B_1048

#include<stdio.h>
#include<string.h>
#define N 100+10
int main()
{
    char A[N], B[N], C[N];
    int LA, LB;
    int i,j,t,a;
    scanf("%s %s", A, B);
    LA = strlen(A);
    LB = strlen(B);
    t = 1;
    i = LA - 1;
    j = LB - 1;
    while (i >= 0 && j >= 0)
    {
        if (t % 2 == 1)
        {
            a = (A[i]-'0' + B[j]-'0') % 13;
            switch (a)
            {
                case 10:B[j] = 'J'; break;
                case 11:B[j] = 'Q'; break;
                case 12:B[j] = 'K'; break;
                default:B[j] = a+'0'; break;
            }
        }
        else
        {
            a = B[j] - A[i];
            if (a < 0)
                a = a + 10;
            B[j] = a+'0';
        }
        i--;
        j--;
        t++;
    }
    if (LB < LA)
    {
        j = LA - LB - 1;
        C[LA - LB] = '\0';
        while (j >= 0&&i >= 0)
        {
            if (t % 2 == 1)
            {
                C[j] = A[i] ;
            }
            else
            {
                a = 0+'0'- A[i];
                if (a < 0)
                    a = a + 10;
                C[j] = a + '0';
            }
            j--;
            i--;
            t++;
        }
        printf("%s", C);
    }
    printf("%s\n", B);
    system("pause");
    return 0;

}