朋友数
n = int(input())
lst = list(input().split())
nos = []
for i in lst:
no = 0
for j in i:
no += int(j)
if no not in nos:
nos.append(no)
print(len(nos))
nos.sort()
for i in nos:
if i ==max(nos):
print(i)
else:
print(i,end = ' ')
朋友数
n = int(input())
lst = list(input().split())
nos = []
for i in lst:
no = 0
for j in i:
no += int(j)
if no not in nos:
nos.append(no)
print(len(nos))
nos.sort()
for i in nos:
if i ==max(nos):
print(i)
else:
print(i,end = ' ')