为何0分?

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5,INF=0x3f3f3f3f;
string a;
int w,l,len,cnt,w2,l2,ans1[N],ans2[N];
bool e;
int main()
{
	while(cin>>a){
		len = a.size();
		for(int i=0;i<len;i++){
			if(a[i]=='W')w++,w2++;
			if(a[i]=='L')l++,l2++;
			if(a[i]=='E'){
				e = 1;
				break;
			}
			if(w>=11&&w-l>=2||l>=11&&l-w>=2){
				cout<<w<<":"<<l<<endl;
				w = l = 0;
			}
			if(w2>=21&&w2-l2>=2||l2>=21&&l2-w2>=2){
				ans1[++cnt] = w2;
				ans2[cnt] = l2;
				w2 = l2 = 0;
			}
		}
		if(e)break;
	}
	cout<<w<<":"<<l<<endl;
	for(int i=1;i<=cnt;i++)cout<<ans1[i]<<":"<<ans2[i]<<endl;
	cout<<w2<<":"<<l2;
	return 0;
}