input = [x for x in range(5, 51)] + [x for x in range(130, 151)] + [200, 201, 220]
 
beginning, current = 0, 0
output = []
for number in sorted(input):
    if not beginning:
        beginning = number
        current = number
        continue
    if number == (current + 1):
        current = number
    else:
        if current == beginning:
            output.append((current, ))
        else:
            output.append((beginning, current))
        beginning = number
        current = number
if current == beginning:
    output.append((current, ))
else:
    output.append((beginning, current))
 
print(input, ' => ', output)
 

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