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550A.cpp
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550A.cpp
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#include<bits/stdc++.h>
using namespace std;
#define ll long long int
int main()
{
string s;
cin >> s;
int l = s.length();
ll mn1 =-1, mx1= -1;
ll mn = -1,mx = -1;
for(int i = 0 ; i < l - 1; i ++)
{
if(s[i] == 'A' && s[i + 1] == 'B')
{
if(mn == -1)
{
mn = i;
mx = i;
}
else
{
mx = i;
}
}
else if(s[i] == 'B' && s[i + 1] == 'A')
{
if(mn1 == -1)
{
mn1 = i;
mx1 = i;
}
else
{
mx1 = i;
}
}
}
if( mn == -1 || mn1 == -1)
{
cout << "NO" << endl;
}
else
{
if( mx1 - mn >=2 || mx -mn1 >=2)
cout << "YES" <<endl;
else
cout << "NO" << endl;
}
}