# coding: utf-8 N,M=map(int,input().split()) A=list(map(int,input().split())) S=list(input()) k=0 p=0 max_k=0 min_k=0 for i in range(M): if S[i]=="L": k-=1 p-=1 else: k+=1 p+=1 max_k=min(max(max_k,k),N-1) min_k=max(min(min_k,k),-(N-1)) p=max(p,0) p=min(p,N-1) LA=[sum(A[:-min_k+1])] RA=[sum(A[N-1-max_k:])] if -min_k+max_k