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# http://www.geeksforgeeks.org/find-common-elements-three-sorted-arrays/

def common_elements(input1, input2, input3):

result = []

i = 0

j = 0

k = 0

while i < len(input1) and j < len(input2) and k < len(input3):

if input1[i] == input2[j] and input2[j] == input3[k]:

result.append(input1[i])

i = i + 1

j = j + 1

k = k + 1

elif input1[i] < input2[j]:

i = i + 1

elif input2[j] < input3[k]:

j = j + 1

else:

k = k + 1

return result

if __name__ == '__main__':

input1 = [1, 5, 10, 20, 40, 80]

input2 = [6, 7, 20, 80, 100]

input3 = [3, 4, 15, 20, 30, 70, 80, 120]

print(common_elements(input1, input2, input3))