n=int(input())
s=list(map(int,input()))
m=0

if s[len(s)-1]==0 :
    print(-1)

else:
    for i in range(n):
        if s[i]==1:
            k = i + 1
            if i==0:
                print(1,end=" ")
                m=1
            else:
                for j in range(m,i+1):
                    print(k,end=" ")
                    k=k-1
                m=i+1