```
file1 = open("file1", "r").read()
file2 = open("file2", "r").read()
flag = ""

if len(file1) == len(file2):
for i in xrange(len(file1)):
if file1[i] == file2[i]:
flag = flag + file1[i]

print("Flag : "+flag)

# Flag : d4rk{lo0king_p4st_0ur_d1ff3renc3s}c0de
```