#include<stdio.h>
int main()
{
    int i, t;
    long long r1, c1, r2, c2, sum1, sum2;
    scanf("%d", &t);
    for(i=0;i<t;i++)
    {
        scanf("%lld %lld %lld %lld", &r1, &c1, &r2, &c2);
        sum1=r1+c1;
        sum2=r2+c2;
        if((sum1%2==0&&sum2%2==0)||(sum1%2!=0&&sum2%2!=0))
        {
            if(sum1==sum2||(r1==c1&&r2==c2)||(r1==c1+2&&r2==c2+2)||(r1==c1+1&&r2==c2+1))
                printf("Case %d: 1\n", i+1);
            else
                printf("Case %d: 2\n", i+1);
        }
        else
            printf("Case %d: impossible\n", i+1);
    }
    return 0;
}