def select(A): B=[] for k in range(len(A)): s=A[k] B.append(s[0]) return B a = ["toi","qua","dep","trai"] print(select(a)) giai thich cau lenh dum em

def select(A): B=[] for k in range(len(A)): s=A[k] B.append(s[0]) return B a = ["toi","qua","dep","trai"] print(select(a)) giai thich cau lenh dum em
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