PY
py
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def incr_mixed_str(s1,s2):
l = len(s1)
s3 = ""
for i in range(l):
if(i%2 == 0):
if(s1[i] == "z"):
s3 = s3 + "a"
else:
s3 = s3 + chr(ord(s1[i])+1)
elif(i%2 == 1):
if(s2[i] == "z"):
s3 = s3 + "a"
else:
s3 = s3 + chr(ord(s2[i])+1)
return s3
str1 = input()
str2 = input()
n = int(input())
for i in range(n-2):
str3 = incr_mixed_str(str1,str2)
str1 = str2
str2 = str3
print(str3)
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OUTPUT
Run