def is_less_than(val_a, val_b):
    """Return True if val_a is less than val_b (evaluate as integer)"""
    size = len(val_a)
    if size != len(val_b):
        return False
    for i in reversed(range(size)):
        if val_a[i] < val_b[i]:
            return True
        elif val_a[i] > val_b[i]:
            return False
    return False