210313

'''

a = list()


while a != 00:
    a = int(input())
    if a != 00:
        print(a)

    else:
        break

'''

'''

c = ord(input())
t = ord('a')
while t<=c :
  print(chr(t), end=' ')
  t = t + 1

'''

'''

a ,d, n =  input().split()
a = int(a)
d = int(d)
n = int(n)

c = a + (n-1)*d

print(c)

'''

'''

a ,r, n =  input().split()
a = int(a)
r = int(r)
n = int(n)

c = a*r**(n-1)

print(c)

'''




'''
a, m, d, n = input().split()

a = int(a)
m = int(m)
d = int(d)
n = int(n)

c = (a * m) +d

print(c)
'''


'''

a = int(input())
b = 0
for a in range(a + 1):
    if a % 2 ==0:
        b+=a

print(b)

'''
'''

a, b, c, n = input().split()

a = int(a)
b = int(b)
c = int(c)
n = int(n)

for i in range(n-1):
    a = a * b + c

print(a)

'''
'''

k = True

while k:
    y = ord(input())
    print(chr(y))
    if chr(y) == 'q':
        k = False
'''

'''

a = int(input())
s = 0
for i in range(1000):
    s = s+i
    if a <= s:
        print(i)
        break

'''

'''

n, m = input().split()
n = int(n)
m = int(m)

for i in range(1, n+1):
    for j in range(1, m+1):
        print(i,j)
        
'''


'''

a = input()
a= int(a,16)

for i in range(1,16):
     print('%X' %a, '*%X' %i, '=%X' %(a*i), sep = '')

'''

'''

a = int(input())

for i in range(1, a+1):
    if i % 10 == 6 or i % 10 == 3 or i % 10 == 9:
        print("X",end = '')

    else:
        print(i , end = '')

'''

'''

a, b, c = input().split()
a = int(a)
b = int(b)
c = int(c)

for i in range(0, a):
    for j in range(0, b):
        for k in range(0, c):
            print(i, j, k)

print(a*b*c)

'''

'''

h, b, c, s = input().split()
h = int(h)
b = int(b)
c = int(c)
s = int(s)
a = (h*b*s*c/8/1024/1024)
print('%.1f'%a, end = 'MB')
'''

'''

w, h, b = input().split()
w = int(w)
h = int(h)
b = int(b)

a = w*h*b/8/1024/1024

print('%.2f'%a, end = ' MB')

'''

'''

a = int(input())
s=0

for i in range(1,a+1):
    s = s +i
    if a <= s:
        print(s)
        break

'''

'''

a = int(input())

for i in range(1,a+1):
    if i %3 ==0:
        continue
    print(i, end = " ")
    
'''

'''

a, b, c = input().split()
a = int(a)
b = int(b)
c = int(c)

d= 1
while d%a != 0 or d%b != 0 or d%c != 0:
    d= d+1
print(d)

'''

'''

n = int(input())
a = input().split()
data = []

for i in range(24):
    data.append(0)

for i in range(len(a)):
    a[i] = int(a[i])
    data[a[i]] = data[a[i]] + 1

for i in range(1, 24):
    print(data[i], end=' ')

'''

'''

n = int(input())
a = input().split()

for i in range(len(a)):
    a[i] = int(a[i])

for i in range(len(a)):
    print(a[n-i-1], end= ' ')

'''

'''

n = int(input())
a = input().split()


for i in range(len(a)):
    a[i] = int(a[i])

s = a[0]
for i in range(len(a)):
    if s > a[i]:
        s = a[i]

print(s)

'''

a = []

a.append(10)
print(a)
a.append(20)
print(a)

a.