def happyLadybugs(b):
    # Write your code here
    temp = {}
    under_score_present = False
    already_happy = True
    n = len(b)
    for i in range(n):
        if b[i] == "_":
            under_score_present = True
            continue
        if already_happy:
            happy_left = True if i > 0 and b[i] == b[i-1] else False
            happy_right = True if i < (n-1) and b[i] == b[i+1] else False
            if not (happy_left or happy_right):
                already_happy = False
        if temp.get(b[i]):
            temp[b[i]] += 1
        else:
            temp[b[i]] = 1
   
    for i in temp:
        if temp[i] == 1:
            return "NO"
            
    return "YES" if under_score_present or already_happy  else "NO"