# Loại bỏ ký tự trùng trong chuỗi
def loai_bo_trung_lap(chuoi):
ky_tu_da_xuat_hien = set()
ket_qua = ''
for ky_tu in chuoi:
if ky_tu not in ky_tu_da_xuat_hien:
ket_qua += ky_tu
ky_tu_da_xuat_hien.add(ky_tu)
return ket_qua
# Nhập chuỗi từ người dùng
chuoi = input("Nhập một chuỗi: ")
# Loại bỏ các ký tự trùng lặp
chuoi_moi = loai_bo_trung_lap(chuoi)
# In chuỗi mới
print("Chuỗi sau khi loại bỏ trùng lặp:", chuoi_moi)
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