string = 'anh di dau choi dodoremon chumeodentutuonglai' #bai a lonnhat = ['', 0] for char in string: if string.count(char) > lonnhat[1]: lonnhat[0] = char #phep index lonnhat[1] = string.count(char) #phepindexx print(lonnhat) #baib string1 = 'toi laia' ketqua = [] for i in string1: ketqua.append((i, string1.count(i))) # ( ky tu, so lan) print(ketqua)