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#include <bits/stdc++.h>
using namespace std;
int main()
{
    string str;
    cin >> str;
    int len = str.length();
    int i = 0, j =  str.length() - 1;
    int res = -1;
    while(i < j)
    {
        if(str[i] != str[j])
            {
                res = i;
                break;
            }
            ++i;
            --j;
    }
        if(res == -1)
        {
            if(res  & 0x1)
            {
                res = str.length()/2;
                
            }   
            else
                res = str.length()/2-1;
        }
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