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#include #include #include #include #include #include #include #include #include #include using namespace std; #define MM(a) memset(a,0,sizeof(a)) typedef long long ll; typedef unsigned long long ULL; const int mod = 1000000007; const double eps = 1e-10; const int inf = 0x3f3f3f3f; const int big=50000; int max(int a,int b) {return a>b?a:b;}; int min(int a,int b) {return a =0;i--) if(a[i]=='B'&&a[i+1]=='A') {yl=min(yl,i);yr=max(yr,i);} if(yl==inf||yr==-1) {printf("NO\n");continue;} if(abs(yl-xr)>1||abs(yr-xl)>1) printf("YES\n"); else printf("NO\n"); } return 0; }
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