int lx[256], ly[256];
void init() {
    char *a[] = { "qwertyuiop", "asdfghjkl", "zxcvbnm" };
    for (int y = 0; y < 3; y++)
        for (int x = 0; x < strlen(a[y]); x++) {
            lx[a[y][x]] = x;
            ly[a[y][x]] = y;
        }
}
int dist(char a, char b) {
    return abs(lx[a] - lx[b]) + abs(ly[a] - ly[b]);
}