#list=[["0", "16"], ["0", "34"], ["10", "15"], ["10", "28"], ["20", "35"], ["20", "58"], ["34", "13"], ["34", "18"], ["34", "20"]]

#list=[["0", "16"], ["1", "13"], ["16", "34"], ["13", "15"], ["1", "28"],["34", "21"],["21", "46"]]

list=[[0, 16], [0, 34], [10, 15], [10, 28], [20, 35], [20, 58], [34, 13], [34, 18], [34, 20]]

while True:

l = []

i = j = 0

while i

#print(i)

flag = 0

j = 1

while j

#print(list[i][len(list[i])-1],list[j][0])

print(i, j, len(list) - i)

if list[i][len(list[i])-1] == list[j][0]:

print(list[i],list[j],j)

l += [list[i] + list[j][1:]]

del list[j]

print(l)

print(list)

flag = 1

else:

j += 1

#print(list, j)

print(j)

if flag == 0:

l += [list[i]]

i += 1

if list == l:

break

list = l

l = []

for i in list:

t = []

for j in i:

t += [int(j)]

l += [t]

print(l)