static int[] engHeck = {3, 2, 1, 2, 3, 3, 2, 3, 3, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 1, 2, 2, 1};

public static void main(String[] args) throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

String first_name = br.readLine();

String second_name = br.readLine();

StringBuffer sb = new StringBuffer();

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

sb.append(Character.toString(first_name.charAt(i)));

sb.append(Character.toString(second_name.charAt(i)));

}

String full_name = sb.toString();

List<Integer> name_num_list = new ArrayList<>();

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

name_num_list.add(engHeck[(full_name.charAt(i)) - 65]);

}

List<Integer> result_list = new ArrayList<>();

while (true) {

for (int i = 0; i < name_num_list.size() - 1; i++) {

int hap = name_num_list.get(i) + name_num_list.get(i + 1);

if (hap >= 10) {

String hap_string = Integer.toString(hap);

result_list.add(hap_string.charAt(hap_string.length() - 1) - '0');

}

else {

result_list.add(hap);

}

}

if (result_list.size() == 2) {

break;

}

name_num_list.clear();

for (int i = 0; i < result_list.size(); i++) {

name_num_list.add(result_list.get(i));

}

result_list.clear();

}

bw.write(Integer.toString(result_list.get(0)) + Integer.toString(result_list.get(1)));

bw.flush();

bw.close();

br.close();

}

}