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    Passed

    def cavityMap(a):
        for i in range(1,len(a)-1):
            for j in range(1,len(a[i])-1):
                if a[i-1][j]<a[i][j] and a[i+1][j]<a[i][j] and a[i][j-1]<a[i][j] and a[i][j+1]<a[i][j]:
                    a[i]=a[i][:j]+"X"+a[i][j+1:]
        return a