Power Strings

Problem Description

Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concatenation as multiplication, exponentiation by a non-negative integer is defined in the normal way: a^0 = "" (the empty string) and a^(n+1) = a*(a^n).

Input

  Each test case is a line of input representing s, a string of printable characters. The length of s will be at least 1 and will not exceed 1 million characters. A line containing a period follows the last test case.

Output

  For each s you should print the largest n such that s = a^n for some string a.

Example Input

abcd
aaaa
ababab
.

Example Output

1
4
3

Hint

 This problem has huge input, use scanf instead of cin to avoid time limit exceed.

#include<stdio.h>
#include<string.h>
int next[1000010];
char s1[1000010],s2[1000010];
void getNext(int n)
{
    int i,k=0;
    next[0]=0;
    for(i=1;i<n;i++)
    {
        while(k>0&&s2[k]!=s2[i]) k=next[k-1];
        if(s2[k]==s2[i])  k++;
        next[i]=k;
    }
}
int main()
{
    int n,m,i;
    while(scanf("%s",s2)!=EOF)
    {
        if(s2[0]=='.') break;
        memset(next,0,sizeof(next));
        m=strlen(s2);
        getNext(m);
        if(m%(m-next[m-1])==0)
        {
            printf("%d\n",m/(m-next[m-1]));
        }
        else printf("-1\n");
    }
    return 0;
}