filename1 = "text_files\\input.txt"
filename2 = "text_files\\upperString.txt"
filename3 = "text_files\\add.txt"
with open(filename1) as f1:
contents1 = f1.read()
with open(filename2) as f2:
contents2 = f2.read()
with open(filename3,"w") as f3:
l = list(contents1.strip()+contents2.strip())
l.sort()
for i in l:
f3.write(i)
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