m=1

for i in range(10):

    m=m*i

print(m)

Private Sub Command1_Click()

    Dim s As String, s1 As String, c As String

    s = Text1.Text

    For i = 1 To Len(s)

        c = Mid(s, i, 1)

        s1 =    ⑴   

        For j =    ⑵   

            If c <> Mid(s, j, 1) Then

                s1 = s1 + Mid(s, j, 1)

            End If

        Next j

           ⑶    

    Next i

Text2.Text = s

End Sub

n=int(input())

a=[0,0,0,0,0,0,0,0,0,0]

c=0

while n>0:

    a[n%10]=a[n%10]+1

    if a[n%10]==1:

        c=c+1

    n=n//10

print(c)

执行上述程序段，若输出c的值为4，则输入n的值可能为（   ）