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## strInput = "a?z" ## Example 1
## strInput = "pe?k" ## Example 2
strInput = "gra?te" ## Example 3
arrOutput = []
arrReplaceList = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
for nIndx, charLoop in enumerate(strInput):
if charLoop != "?":
arrOutput.append(charLoop)
continue
## print (nIndx, charLoop)
arrExclude = []
if nIndx > 0:
arrExclude.append(strInput[nIndx - 1])
if nIndx < len(strInput) - 1:
arrExclude.append(strInput[nIndx + 1])
arrOutput.append([charSubLoop for charSubLoop in arrReplaceList if not charSubLoop in arrExclude][0])
print ("".join(arrOutput))
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