d537

/* d537            */
/* AC (3ms, 144KB) */
#include <cstdio>
#include <cstring>

using namespace std;

int color_plate[102][102];

int colorid(char ch)
{
    switch(ch)
    {
        case 'R':
            return 1;
        case 'B':
            return 2;
        case 'Y':
            return 4;
        case 'P':
            return 3;
        case 'O':
            return 5;
        case 'D':
            return 7;
        case 'G':
            return 6;
    }
}

int check(int color, int &color_number, int N)
{
    for(int y = 0; y < N; ++y)
        for(int x = 0; x < N; ++x)
            if(color_plate[y][x] == color)
                ++color_number;
}
bool inside(int x, int y, int N)
{
    return (x >= 0 && x < N && y >= 0 && y < N);
}
int main()
{
    for(int N, Max_area = 0; ~scanf("%d", &N); Max_area = 0)
    {
        char ch[2];
        int _X[3], _Y[3], COLOR[3];
        memset(color_plate, 0, sizeof(color_plate));

        for(int i = 0, x, y; i < 3 && scanf("%s %d %d", ch, &x, &y); ++i)
        {
            _X[i] = x;
            _Y[i] = N - y - 1;
            COLOR[i] = colorid(ch[0]);
            color_plate[N - y - 1][x] = colorid(ch[0]) | color_plate[N - y - 1][x];
        }
        scanf("%s", ch);
        int color = colorid(ch[0]);

        for(int t = 0, area = 0; t <= N; ++t, area = 0)
        {
            check(color, area, N);
            Max_area = (Max_area < area ? area : Max_area);
            for(int i = 0; i < 3; ++i)
            {
                int y = _Y[i], x = _X[i], ty = y - t, dy = y + t, lx = x - t, rx = x + t;
                if(ty < 0) ty = 0;
                if(dy >= N) dy = N - 1;
                if(lx < 0) lx = 0;
                if(rx >= N) rx = N - 1;
                for(int Y = ty; Y <= dy; ++Y)
                    for(int X = lx; X <= rx; ++X)
                        color_plate[Y][X] |= COLOR[i];
            }
        }
        printf("%d\n", Max_area);
    }
    return 0;
}