#include<stdio.h>
int main()
{
    int n;
    while( scanf("%d",&n)!=EOF)
    {
        int a[n],i;
        static int x=1;
        for( i=0; i<n; i++)
        {
            scanf("%d",&a[i]);
        }

        for(i=0; i<n; i++)
        {
            if( a[i]+a[i+1]==a[i+2])

                break;
            else
                continue;
        }
        if( a[i]+a[i+1]==a[i+2])
        {
            printf("Case #%d: ",x);
            for(i=0; i<n; i++)
            {
                printf("%d ",a[i]);
            }
            printf("\nThis is not an A-sequence.\n");
        }
        else
        {
            printf("Case #%d: ",x);
            for(i=0; i<n; i++)
            {
                printf("%d ",a[i]);
            }
            printf("\nThis is an A-sequence.\n");
        }
        x++;
    }
    return 0;

}