a=input().split()
a=list(map(int,a))
def check_is_huiwen(number):
base_num=number
num=0
while number:
num=num*10+number%10
number//=10
return num==base_num
count = 0
for i in range(0,len(a)-1):
for j in range(i+1,len(a)):
if check_is_huiwen(a[i]+a[j]):
print(a[i],a[j])
count+=1
print(count)
