cat decode.py
```
dflag="109.92.95.92.109.118.109.92.105.95.90.100.110.90.105.106.111.90.98.106.106.95.90.100.95.96.92.90.103.106.103.120.102"
numbers = dflag.split(".")

flag = ""
randkey=chr(int(numbers[-1])-49)
print "randkey: "+randkey

for i in range(0,len(numbers)-1):
flag+=chr(int(numbers[i])+int(randkey))

print flag
```

python decode.py

randkey: 5

radar{rand_is_not_good_idea_lol}