paint_colors

from collections import deque

main_colors = {"red", "yellow", "blue"}
secondary_colors = {"orange", "purple", "green"}

subcolors_dict = {"orange": ["red", "yellow"], "purple": ["red", "blue"], "green": ["yellow", "blue"]}

collected_colors = []


text = deque(input().split())

while text:
    start_string = text.popleft()
    end_string = text.pop() if text else ""

    variant_1 = start_string + end_string
    variant_2 = end_string + start_string

    if variant_1 in main_colors or variant_1 in secondary_colors:
        collected_colors.append(variant_1)
        continue
    elif variant_2 in main_colors or variant_2 in secondary_colors:
        collected_colors.append(variant_2)
        continue

    else:
        if start_string[:-1]:
            text.insert(len(text) // 2, start_string[:-1])
        if end_string[:-1]:
            text.insert(len(text) // 2, end_string[:-1])


for color in collected_colors:
    if color in secondary_colors:
        for needed_color in subcolors_dict[color]:
            if needed_color not in collected_colors:
                while color in collected_colors:
                    collected_colors.remove(color)
                break

print(collected_colors)