paint_color

substr = input().split()

main_colors = ['red', 'yellow', 'blue']
secondary_colors = {'orange': ['red', 'yellow'], 'purple': ['red', 'blue'], 'green': ['yellow', 'blue']}
found = []
added = ''

while substr:
    if len(substr) > 1:
        first = substr[0]
        l_f = len(first)
        last = substr[-1]
        l_l = len(last)
        if (first + last) in main_colors or (first + last) in secondary_colors:
            added = first + last
            found.append(added)
            substr.pop(0)
            substr.pop()
        elif (last + first) in main_colors or (last + first) in secondary_colors:
            added = last + first
            found.append(added)
            substr.pop(0)
            substr.pop()
        else:
            if l_l > 1:
                last = last[:len(last)-1]
                substr = substr[:(len(substr) // 2)] + [last] + substr[len(substr) // 2:]
            substr.pop()

            if l_f > 1:
                first = first[:len(first)-1]
                substr = substr[:(len(substr) // 2)] + [first] + substr[len(substr) // 2:]
            substr.pop(0)
            # added = first + last
            # added = added[1:len(added) - 1]

    else:
        added = substr.pop()
        if added in main_colors or added in secondary_colors:
            found.append(added)
        else:
            break

for color, main in secondary_colors.items():
    if color in found:
        if main[0] not in found or main[1] not in found:
            found.remove(color)
print(found)