x, y = list(map(int, input().split(' ')))
k=x+y
v=0
z=1
if x==y:
      pass
elif x==1 and y==0:
      print('1:0')
elif x==1:
      for j in range(1,y+1):
            print(str(1)+':'+str(j))
elif x==0:
      i=0
      for j in range(1,y+1):
            print(str(0)+':'+str(j))
elif y==0:
      for j in range(1,x+1):
            print(str(j)+':'+str(0))
else:
      for i in range(1,x):
            print(str(i)+':'+str(0))
      if x<y:
            while z<=i:
                  print(str(i)+':'+str(z))
                  z+=1
      else:
            while z<=y:
                  print(str(i)+':'+str(z))
                  z+=1
      for j in range(z-1,y+1):
            print(str(i+1)+':'+str(j))