import java.util.HashMap;

import java.util.Map;

public class Task1 {

public static void main(String[] args) {

String[] A = {"CC0","AB0",};

int[] B = {12,12};

System.out.println(solution(A,B));

}

public static String solution(String[] A, int[] B){

Map<String,Integer> map = new HashMap<>();

String maxInvestmentCountry="";

int maxValue=0;

for(int i=0;i<A.length;i++) {

String country = A[i].substring(0, 2);

int val;

if (map.containsKey(country)) {

val = map.get(country);

val += B[i];

} else {

val = B[i];

}

map.put(country, val);

if (val > maxValue) {

maxValue = val;

maxInvestmentCountry = country;

}

}

return maxInvestmentCountry;

}

}