#include <bits/stdc++.h>

#define pb push_back
#define F first
#define S second
#define ll long long
#define ld long double
#define endl '\n'

using namespace std;

ll s;
int x1[10000], x2[10000], y1[10000], y2[10000];
bool z[10000];

int main() {

    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m, k;
    cin >> n >> m >> k;
    swap(n, m);
    for(int i = 0; i < k; ++i) {
        int x, y;
        cin >> x >> y;
        char c;
        cin >> c;
        if(c == 'N') {
            x1[i] = x;
            y1[i] = y;
            x2[i] = x;
            y2[i] = n;
        } else if (c == 'S') {
            x2[i] = x;
            y2[i] = y;
            x1[i] = x;
            y1[i] = 1;
        } else if (c == 'W') {
            x2[i] = x;
            y2[i] = y;
            x1[i] = 1;
            y1[i] = y;
        } else {
            x1[i] = x;
            y1[i] = y;
            x2[i] = m;
            y2[i] = y;
        }
    }
//    for(int i = 0; i < k; ++i) {
//        cout << x1[i] << ' ' << x2[i] << ' ' << y1[i] << ' ' << y2[i] << endl;
//    }
    for(int i = 0; i < k; ++i) {
        for(int j = 0; j < k; ++j) {
            if(i == j) continue;
            if ( x1[i] == x2[i] && x2[j] == x1[j] && x1[i] == x1[j] && y1[i] == 1 && y2[j] == n && y1[j] <= y2[i] ) y2[i] = n;
            if (y1[i] == y2[i] && y2[j] == y1[j]&& y1[i] == y1[j] && x1[i] == 1 && x2[j] == m && x1[j] <= x2[i]) x2[i] = m;
        }
    }
    for(int i = 0; i < k; ++i) {
        if(!z[i]) {
            for(int j = 0; j < k; ++j) {
                if(!z[i] && i!=j) {
                  if ( x1[j] >= x1[i] && x2[j] <= x2[i] && y1[j] >= y1[i] && y2[j] <= y2[i] ) {
                        z[j] = 1;
                    }
                }
            }
        }
    }
    for(int i = 0; i < k; ++i) {
     if (!z[i]) s +=  (( x2[i] - x1[i] + 1 ) * ( y2[i] - y1[i] + 1 ));
    }
   for(int i = 0; i < k; ++i) {
     if (!z[i]) {
       for(int j = 0; j < k; ++j) {
         if (!z[j] && i != j ) {
           if ( x1[j] >= x1[i] && x2[i] >= x2[j] && y1[j] <= y1[i] && y2[j] >= y2[i] ) s--;
         }
       }
     }
   }
    cout << s;
    return 0;
}