Seek the Name, Seek the Fame

#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
const ull p=47;
char s[400005];
ull power[400005],sum[400005];
int main() 
{
    power[0]=1;
    for(int i=1;i<400000;i++)
        power[i]=power[i-1]*p;
    while(~scanf(" %s",s+1))
    {
        int len=strlen(s+1);
        for(int i=1;i<=len;i++)
            sum[i]=sum[i-1]*p+s[i];
        for(int i=1;i<=len;i++)
        {
            ull s1=sum[i];
            ull s2=sum[len]-sum[len-i]*power[i];
            if(s1==s2)printf("%d ",i);
        }
        printf("\n");
    }
    return 0;
}