#include <bits/stdc++.h>

using namespace std;

int n, cnt;
char x[1005];

int main() {
	scanf("%s", x);
	n = strlen(x);
	for (int i = 2; i < n - 1; i++)
		cnt += x[i] == 'C';
	cnt *= x[0] == 'A';
	for (int i = 1; i < n; i++)
		if (x[i] != 'C' && x[i] <= 'Z')
			cnt = 0;
	printf(cnt == 1 ? "AC\n" : "WA\n");
	return 0;
}
