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import java.util.HashMap;

import java.util.HashSet;

import java.util.Set;

public class BullsAndCows {

public String getHint(String secret, String guess) {

HashMap<Character, Set<Integer>> map1 = new HashMap<>();

HashMap<Character, Set<Integer>> map2 = new HashMap<>();

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

Set<Integer> set = map1.getOrDefault(secret.charAt(i), new HashSet<>());

set.add(i);

map1.put(secret.charAt(i), set);

}

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

Set<Integer> set = map2.getOrDefault(guess.charAt(i), new HashSet<>());

set.add(i);

map2.put(guess.charAt(i), set);

}

int bulls = 0, cows = 0;

for (Character c : map2.keySet()) {

Set<Integer> set1 = map1.get(c);

if (set1 == null) {

continue;

}

Set<Integer> set2 = map2.get(c);

int count = 0;

for (Integer index : set2) {

if (set1.contains(index)) {

count++;

}

}

bulls += count;

cows += Math.min(set1.size(), set2.size()) - count;

}

return String.format("%dA%dB", bulls, cows);

}

}