def solution(v):
answer = []
x = []
y = []
for dot in v:
if dot[0] in x:
x.remove(dot[0])
else:
x.append(dot[0])
if dot[1] in y:
y.remove(dot[1])
else:
y.append(dot[1])
answer.append(x[0])
answer.append(y[0])
return answer