python随便输入两个字符串 两个字符串相同的字符打印

随便输入两个字符串 两个字符串相同的字符打印 有没有大佬帮忙解决

str1=input()
str2=input()
result=''
for i in str1:
    for j in str2:
        if i==j and i not in result:
            result+=i
print(result)

s1 = input(">>>")
s2 = input(">>>")

print(set(s1) & set(s2))