C++ :

#include<bits/stdc++.h>
#define N 100005
using namespace std;
char a[N];
int b1,b2,c1,c2,v,a1[N],a2[N],a3[N],a4[N],cnt1,cnt2;
int main()
{
	while(cin>>a){
		int len=strlen(a);
		for(int i=0;i<len;i++){
			if(a[i]=='E'){
				v=1;
				break;
			}
			if(a[i]=='W'){
				b1++,c1++;
				if(b1>=11&&b1-b2>=2){
					a1[++cnt1]=b1;
					a2[cnt1]=b2;
					b1=b2=0;
				}
				if(c1>=21&&c1-c2>=2){
					a3[++cnt2]=c1;
					a4[cnt2]=c2;
					c1=c2=0;
				}
			}
			if(a[i]=='L'){
				b2++,c2++;
				if(b2>=11&&b2-b1>=2){
					a1[++cnt1]=b1;
					a2[cnt1]=b2;
					b1=b2=0;
				}
				if(c2>=21&&c2-c1>=2){
					a3[++cnt2]=c1;
					a4[cnt2]=c2;
					c1=c2=0;
				}
			}
		}
		if(v){
			a1[++cnt1]=b1;
			a2[cnt1]=b2;
			a3[++cnt2]=c1;
			a4[cnt2]=c2;
			break;
		}
	}
	for(int i=1;i<=cnt1;i++)
		cout<<a1[i]<<":"<<a2[i]<<endl;
	cout<<endl;
	for(int i=1;i<=cnt2;i++)
		cout<<a3[i]<<":"<<a4[i]<<endl;
	return 0;
}