Python Easy Solution - 90+% Faster
\nclass Solution:\n    def modifyString(self, s: str) -> str:\n        prev = \'\'\n        for index,value in enumerate(s):\n            if value == \'?\':\n  
```\nclass Solution:\n    def modifyString(self, s: str) -> str:\n        prev = \'\'\n        for index,value in enumerate(s):\n            if value == \'?\':\n                if index+1 < len(s):\n                    for i in range(97,123):\n                        if chr(i) !=s[index+1] and chr(i) != prev:\n                            s = s[:index]+chr(i)+s[index+1:]\n                            break\n                else:\n                    for i in range(97,123):\n                        if chr(i) != prev:\n                            s = s[:index]+chr(i)+s[index+1:]\n                            break\n            prev = s[index]\n        return s\n```
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