20 lines
376 B
Python
20 lines
376 B
Python
import sys
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input = sys.stdin.readline
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class SeongjunEncryption:
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def __init__(self, n, t):
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self.n = n
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self.t = t
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def solve(self) -> bool:
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return self.t[0] == 'A' and self.t[-1] == 'B'
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if __name__ == "__main__":
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n = int(input())
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t = input().strip()
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print("Yes" if SeongjunEncryption(n, t).solve() else "No")
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