from random import randint
str = list('x' * 100)
one = 0
two = 0
three = 0
four = 0
for i in range(0, len(str)):
    while True:
        y = (randint(0, 99))
        if "x" in str[y]:
            break
    if one < 10:
        str[y] = "1"
        one = one + 1
    elif two < 10:
        str[y] = "2"
        two = two + 1
    elif three < 30:
        str[y] = "3"
        three = three + 1
    elif four < 50:
        str[y] = "4"
        four = four + 1
print("".join(str))