# Emulate zip and padding map: generate results

def myzip(*seqs):
    seqs = [list(S) for S in seqs]
    while all(seqs):
        yield tuple(S.pop(0) for S in seqs)

def mymapPad(*seqs, pad=None):
    seqs = [list(S) for S in seqs]
    while any(seqs):
        yield tuple((S.pop(0) if S else pad) for S in seqs)