#include <iostream>#include <string>using namespace std;int main() {    int T;    cin >> T;    while (T--) {        string s;        cin >> s;        int l = 0;        int r = s.size() - 1;        while (l < r && s[l] == s[r]) {            l++;            r--;        }        if (l >= r) {            cout << -1 << endl;            continue;        }        int ll = l + 1;        int rr = r;        while (ll < rr && s[ll] == s[rr]) {            ll++;            rr--;        }        if (ll >= rr) {            cout << l << endl;        } else {            cout << r << endl;        }    }    return 0;}