def intersection_of_two_string(str1, str2):
result = ""
for ch in str1:
if ch in str2 and not ch in result:
result += ch
return result
str1 = 'Python3.9.7 Java 8 Update 301'
str2 = 'Python3.8.12 Java 8 Update 8u20'
print(intersection_of_two_string(str1, str2))
'''
run:
Python3. Jav8Upde01
'''