#include <iostream>
const int N = 65000;
char s[N], n;
void read() {
	char c = getchar();
	while (c != 'E') {
		if (c == ' ' || c == '\n') {
			c = getchar();
			continue;
		}
		s[++n] = c;
		c = getchar();
	}
}
void f(int score) {
	for (int i = 1, l = 0, r = 0; i <= n; i++) {
		if (s[i] == 'W')	++l;
		else ++r;
		if (std::abs(l - r) >= 2 && (l >= score || r >= score)) {
// 			std::cout << l << ':' << r << std::endl;
            printf("%d:%d\n", l, r);
			l = 0, r = 0;
		}
		if (i == n) {
// 			std::cout << l << ':' << r << std::endl;
            printf("%d:%d\n", l, r);
			l = 0, r = 0;
			continue;
		}
	}
}

int main() {
	read();
	f(11);
// 	std::cout << std::endl;
    printf("\n");
	f(21);
	return 0;
}

只有10分，两个WA，其他都是RE