#include<bits/stdc++.h>
using namespace std;
int w=0;
int l=0;
int cnt=0;
string s;
int rule(int r)
{
	w=0;
	l=0;
	for(int i=0;i<cnt-1;i++)
	{
		if(s[i]=='W')
		{
			w++;
		}
		else
		{
			l++;
		}
		if((w>=r || l>=r)&&(abs(w-l)>=2))
		{
			cout<<w<<':'<<l<<endl;
			w=l=0;
		}
	}
	cout<<w<<':'<<l<<endl;
}
int main()
{
	char tmp;
	while(tmp!='E')
	{
		cin>>tmp;
		s[cnt++]=tmp;
		
	}
	rule(11);
	cout<<endl;
	rule(21);
	return 0;
}