s="D5u6p@1_2t3B" num=0
for i in s[::-1]:
if "a"<=i<="z" or "A"<=i<="Z" or "0"<=i<="9":
if "0"<=i<="9":
num=num*10+int(i)
else:
break print(num)
该部分程序段运行后,变量 num 的值是( )