#include <iostream>
#include <algorithm>
using namespace std;
string  str;
char c;
void work( int score)
{
    int a = 0, b = 0;
    for (int i = 0; i < str.size() && str[i] != 'E'; i ++ )
    {
        if (str[i] == 'W') a ++ ;
        else b ++ ;

        if (max(a, b) >= score && abs(a - b) >= 2)
        {
            printf("%d:%d\n", a, b);
            a = b = 0;
        }
    }
    printf("%d:%d\n", a, b);
}


int main()
{

    while (cin >> c) str += c;

    work(11);
    puts("");
    work( 21);

    return 0;
}