#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
const int N = 1e6 + 5;

char str[N];
int Next[N], T;

int main()
{
    int n;
    while (scanf("%d", &n), n)
    {
        printf("Test case #%d\n", ++T);
        memset(Next, 0, sizeof(Next));
        scanf("%s", str+1);

        int len = strlen(str+1);
        for (int j = 0, i = 2; i <= len; ++i)
        {
            while (j && str[j+1] != str[i]) j = Next[j];
            if (str[j+1] == str[i]) j++;
            Next[i] = j;
        }

        for (int i = 2; i <= len; ++i)
        {
            int t = i - Next[i];
            if (t != i && i % t == 0) 
            {
                printf("%d %d\n", i, i/t);
            }
        }
        puts("");
    }
    return 0;   
}