#include<iostream>
#include <bits/stdc++.h>

#define ll long long
#define IO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
const int N = 500 + 5, inf = 2e9;

pair<int, int> get(string A, string AA) {
    if (A == "AD") {
        return {stoi(AA), 0};
    } else {
        return {stoi(A), 1};
    }
}

void doWork() {
    string A, AA, B, BB;
    cin >> A >> AA >> B >> BB;
    pair<int, int> x = get(A, AA), y = get(B, BB);
    if (x.second == y.second) {
        cout << abs(x.first - y.first);
    } else {
        cout << x.first + y.first - 1;
    }

}

int main() {
    IO
    int t = 1;
    //cin >> t;
    for (int i = 1; i <= t; i++) {
        //  cout << "Case #" << i << ": ";
        doWork();
    }
}