计蒜客 T1725 国王的魔镜

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//
// Created by Leo Lee on 2019/4/5.
//

#include <iostream>
#include <string>
using namespace std;
unsigned long minLong(string str);
int main(){
    string str;
    cin>>str;
    cout<<minLong(str)<<endl;
    return 0;
}

unsigned long minLong(string str){
    unsigned long L=0,R=str.size()-1;
    unsigned long minlen = R-L+1;
    while(minlen!=1){
        while(L<R){
            if(str[L]!=str[R])
                return minlen;
            L++;R--;
        }
        L = 0;R=R;
        minlen = R-L+1;
    }
    return minlen;
}