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#include <cstdio>
int main()
{
    int N;
    char c;
    int flag = 0;
    scanf("%d\n",&N);
    for(int i=0;i<=N;i++){
        scanf("%c",&c);
        if(c=='H') flag ^= i+1;
    }
    printf(flag?"Alice\n":"Bob\n");
}
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