Matrix

a = int(input())
b = int(input())
c = int(input())
d = int(input())

for frfn in range(a, b + 1):
  for frsn in range(a, b + 1):
    for srfn in range(c, d + 1):
      for srsn  in range(c, d + 1):
        if (frfn + srsn) == (frsn + srfn) and frfn != frsn and srfn != srsn:
          print(f"{frfn}{frsn}")
          print(f"{srfn}{srsn}\n")