hdu1358Period

#include<iostream>
#include<cstring>
#include<cstdio>
#include<cmath>

using namespace std;

char s[1100000];
int pn[1100000];
int nextt[1100000];


int main()
{
    int l,z = 0,i,j,k;
    while(scanf("%d",&l)!=EOF,l)
    {
        printf("Test case #%d\n",++z);
        scanf("%s",s+1);
        nextt[1] = 0;
        pn[1] = 1;
        for(i = 2;i<=l;i++)
        {
            int t = nextt[i-1];
            while(t&&s[i]!=s[t+1]) t = nextt[t];
            if(s[i] == s[t+1]) t++;
            nextt[i] = t;
            if(t == 0) pn[i] = 1;
            else if(i-t == t/pn[t]) pn[i] = pn[t]+1,printf("%d %d\n",i,pn[i]);
            else pn[i] = 1;
        }
        puts("");
    }
}