#include <iostream>
#include <cstring>
using namespace std;

void jisuan(string d, int s){
    int a = 0, b = 0;
    for(auto x:d){
        if(x == 'W') a++;
        else b++;
        if(max(a, b) >= s && abs(a - b) >= 2){
            printf("%d:%d\n", a, b);
            a = 0;
            b = 0;
        }
    }
    printf("%d:%d\n", a, b);
}

int main(){

    string data = "";

    char t;
    while (true){
        cin >> t;
        if(t == 'E') break;
        data += t;
    }

    jisuan(data, 11);
    cout << endl;
    jisuan(data, 21);

    return 0;
}