Python Solution

def happyLadybugs(b):
        # Write your code here

        for colour in set(b):
                if colour != "_" and b.count(colour) == 1:
                        return "NO"

        if b.count("_") > 0:
                return "YES"

        for i in range(len(b)):
                if i == 0 and b[0] != b[1]:
                        return "NO"
                if i == len(b) - 1 and b[-1] != b[-2]:
                        return "NO"
                if b[i] != b[i-1] and b[i] != b[i+1]:
                        return "NO"

        return "YES"