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def proc(list):
print("Input: list = ", list)
print("Output: ", end='')
init_flag = False
cont_flag = False
for i in range(-1 + len(list)):
diff = list[i+1] - list[i]
if (init_flag and cont_flag):
if (diff != 1):
init_flag = False
cont_flag = False
print("-", list[i], end='', sep='')
elif (init_flag):
if (diff == 1):
cont_flag = True
else:
init_flag = False
print(",", list[i], end='')
else:
if (i != 0):
print(", ", end='')
print(list[i], end='')
if (diff == 1):
init_flag = True
if (init_flag and cont_flag):
print("-", list[len(list) - 1], sep='')
else:
print(", ", list[len(list)- 1])
list = [1,2,3,4,9,10,14,15,16]
proc(list)
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