:)

from_ahn.py

def iterate(a, b, c):
    l = [a, b, c]
    l = [n if n else 1 for n in l]
    def find(chosen, got):
        if got == 3:
            print(''.join(chosen))
            return
        for i in range(l[got]):
            chosen.append(str(i))
            find(chosen, got+1)
            chosen.pop()
    find([], 0)
    
print(iterate(2, 0, 3))