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#include <iostream>

#include <fstream>

using namespace std;

ifstream fin("input.txt");

int main(){

fin>>S;

int sz = S.size();

int rec_start = -1;

int rec_end = -1;

int t_ans = -1;

for(int i=0; i<sz; i++){

for(int j=i+1; j<sz; j++){

int front = i;

int rear = j;

bool ok = true;

while(front <= rear ){

if(S[front]==S[rear]){

front++,rear--;

}else{

ok=false;

}

}

if(ok){

if( j-i+1 >= t_ans){

t_ans = j-i+1;

rec_start = i;

rec_end = j;

}

}

}

}

for(int i=rec_start; i<=rec_end; i++){

cout<<S[i];

}cout<<endl;

return 0;

}