Appending to a text string

[syno7878]

Hi All

I think I'm nearly there with the code:

f = open("file.txt", "rt")
s = f.read()
f = open("new-file.txt", "wt")

for count in range(1,201):
    s+=str(count)
    print({s},{count})
   
f.write(s) 
f.close()

However, its printing the string within the file followed by the count, for example its writing to the new-file like this:

password12345678910111213, etc

What I'm looking to achieve is the below:

password1password2password3, etc.

Thank you