static void solve() {
		for (int i = 0; i < 4; i++) 
			for (int j = 0; j < 4; j++) 
				if (a[i][j] == word.charAt(0)) {
					u[i][j] = true;
					solveBack(a[i][j] + "", i, j);
					u[i][j] = false;
				}
	}