import sys

sys.setrecursionlimit(4500)

def AddTransition(transitions, state_from, state_to, symbol):
    if state_from in transitions:
        if symbol not in transitions[state_from]:
            transitions[state_from][symbol] = {state_to}
        else:
            transitions[state_from][symbol] |= {state_to}
    else:
        transitions[state_from] = {symbol: {state_to}}

def AddFinalState(final_states, state):
    final_states.add(state)

def GetFinalState(transitions, final_states, string, current_state):
    if not string:
        return current_state if current_state in final_states else -1

    symbol, rest = string[0], string[1:]

    try:
        for state in transitions[current_state][symbol]:
            result = GetFinalState(transitions, final_states, rest, state)
            if result != -1:
                return result
    except KeyError:
        return -1

    return -1

def IsAccepted(transitions, finalStates, string, initial_state):
    finalState = GetFinalState(transitions, finalStates, string, initial_state)
    return finalState in finalStates


transitions = {}
finalStates = {2}

AddTransition(transitions, 0, 0, 'a')
AddTransition(transitions, 0, 0, 'b')
AddTransition(transitions, 0, 0, 'c')
AddTransition(transitions, 0, 1, 'b')
AddTransition(transitions, 1, 2, 'a')
AddTransition(transitions, 1, 2, 'b')
AddTransition(transitions, 1, 2, 'c')


for line in sys.stdin:
    line = line.rstrip()

    if IsAccepted(transitions, finalStates, line, 0):
        print('YES')
    else:
        print('NO')