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def merge_sorted(xs, ys):
result = []
i = 0
j = 0
while i < len(xs) and j < len(ys):
if xs[i] <= ys[j]:
result.append(xs[i])
i += 1
else:
result.append(ys[j])
j += 1
while i < len(xs):
result.append(xs[i])
i += 1
while j < len(xs):
result.append(ys[j])
j += 1
return result
################################################################################
# Tests
################################################################################
xs = [3, 4, 6, 10, 11, 15]
ys = [1, 5, 8, 12, 14, 19]
result = merge_sorted(xs, ys)
print(result)
assert len(result) == len(xs) + len(ys)
assert result == [1, 3, 4, 5, 6, 8, 10, 11, 12, 14, 15, 19]
print("Success!")
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