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#include <string>
#include <vector>
#include <iostream>
using namespace std;

string solution(string s) {
    string answer = "";
    int slen = (int)s.length();
    int center = slen/2;
    if(slen%2){ //홀수
        answer = s[center];
    }
    else{   //짝수
        answer =s[center-1];
        answer +=s[center];
    }
    return answer;
}