#include<stdio.h>
#include<string.h>
#include <iostream>
#include <algorithm>
#include <stdlib.h>
using namespace std;
int a[10][30]={
{-1},
{-1},
{-1},
{-1,1,2,6,10},
{-1,0,4,5,9},
{-1,3,7,8,40,50,60},
{-1,11,12,20,30,80,90},
{-1,15,16,70},
{-1,13,14,18,19,41,42,46,51,52,56,61,62,66},
{-1,17,21,22,26,31,32,36,44,45,49,54,55,59,64,65,69,81,82,86,91,92,96}
};
char str[5][200] ={"0",
    "10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "20000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "60000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
};
int main()
{
    int tcase;
    scanf("%d",&tcase);
    int t = 1;
    while(tcase--){
        int k,b;
        scanf("%d%d",&k,&b);
        printf("Case #%d: ",t++);
        if(k==3){
            if(b>4) printf("-1\n");
            else printf("%d\n",a[k][b]);
        }
        if(k==4){
            if(b>4) printf("-1\n");
            else printf("%d\n",a[k][b]);
        }
        if(k==5){
            if(b>6) printf("-1\n");
            else printf("%d\n",a[k][b]);
        }
        if(k==6){
            if(b>6) printf("-1\n");
            else printf("%d\n",a[k][b]);
        }
        if(k==7){
            if(b>3) printf("-1\n");
            else printf("%d\n",a[k][b]);
        }
        if(k==8){
            if(b>13) printf("-1\n");
            else printf("%d\n",a[k][b]);
        }
        if(k==9){
            if(b>26) printf("-1\n");
            else if(b>22) printf("%s\n",str[b-22]);
            else printf("%d\n",a[k][b]);
        }
    }
    return 0;
}