Submission #2117652

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Source Code Expand

n=int(input())
s=input()
x="b"
k=0
if n%2==0:
    print(-1)
else:
    for i in range(int((n-1)/2)):
        if (i+1)%3==1: x="a"+x+"c"
        elif (i+1)%3==2: x="c"+x+"a"
        else: x="b"+x+"b"
        k+=1
if s==x:
    print(k)
else:
    print(-1)

Submission Info

Judge Result