C++ :

#include<cstdio>
#include<cmath>
  int main()
  {
  	//freopen("1.txt","r",stdin);
  	//freopen("2.txt","w",stdout);
  	
          int W1,L1,W2[10000]={0},L2[10000]={0},i,j;
          char ch;
          int f1=0,f2=0;
 
          i=0;
          W1=L1=0;
          ch=getchar();
          while(ch!='E')
         {
               if(ch=='W')
                  {
                          W1++;
                          W2[i]++;
                 }
                  else if(ch=='L')
                 {
                         L1++;
                        L2[i]++;
                }
                 if(W1>=11||L1>=11)
             {
                          if(fabs(W1-L1)>=2)
                         {
                                  f1=1;
                                 printf("%d:%d\n",W1,L1);
                                  W1=L1=0;
                         }
                  }
                  if(W2[i]>=21||L2[i]>=21)
                  {
                          if(fabs(W2[i]-L2[i])>=2)
                          {
                                  i++;
                          }
                  }
                  
                  ch=getchar();
          }
           
          
                  printf("%d:%d\n",W1,L1);
          
          printf("\n");
         for(j=0;j<i;j++)
          {
                  f2=1;
                  printf("%d:%d\n",W2[j],L2[j]);
          }
          
                  printf("%d:%d\n",W2[j],L2[j]);
          
         //fclose(stdin);
         //fclose(stdout)
         return 0;
 }