#include <cstdio>#include <cstdlib>using namespace std;char line[1001];char line2[2003];int syslen(char str[], int start) {    int len = 1;    int p = start - 1;    int q = start + 1;    while (p >=0 && str[q] != ‘\0‘ && str[p] == str[q]) {        p--, q++;        len += 2;    }    return len;}int main() {    scanf("%[^\n]s", line);        int p = 0, q = 0;    line2[p++] = ‘ ‘;    line2[p++] = line[q++];    while (line[q] != ‘\0‘) {        line2[p++] = ‘ ‘; // dummy char used as seperator        line2[p++] = line[q++];    }    line2[p++] = ‘ ‘;    line2[p] = ‘\0‘;    int max_len = 0;    for (int i=0; i<p; i++) {        int cur_len = syslen(line2, i);        if (cur_len > max_len) max_len = cur_len;    }    printf("%d", max_len/2);    return 0;}