#include<bits/stdc++.h>
using namespace std;
int main()
{
string s;
char c;
for (int i = 1;; i++)
{
cin >> c;
s = s + c;
if (c == 'E')
{
break;
}
}
int a = 0,b = 0;
for(int i = 0; i < s.size() && s [i] != 'E';i++)
{
if (s [i] == 'W') a++;
else b++;
if (max (a,b) >= 11 && abs (a-b) >= 2)
{
cout << a << ":" << b << endl;
a = b = 0;
}
}
cout << a << ":" << b << endl;
for(int i = 0; i < s.size() && s [i] != 'E';i++)
{
if (s [i] == 'W') a++;
else b++;
if (max (a,b) >= 21 && abs (a-b) >= 2)
{
cout << a << ":" << b << endl;
a = b = 0;
}
}
cout << a << ":" << b << endl;
return 0;
}