import strutils, sequtils, math

var a = newSeq[int64](100010)

proc f(i, n: int, b: seq[int64]): int64 =
  if i > n: return -1
  if i mod 2 == 0:
    a[i] = a[i-1] - b[i-1]
    if a[i] <= 0 or 10^18 < a[i]: return abs(a[i])
    return f(i+1, n, b)
  else:
    a[i] = b[i-1] - a[i-1]
    if a[i] <= 0 or 10^18 < a[i]: return abs(a[i])
    return f(i+1, n, b)

when isMainModule:
  var
    n = stdin.readLine.parseInt
    b = newSeq[int64](n)

  for i in 0..n-1:
    b[i] = stdin.readLine.parseBiggestInt


  var
    d: int64 = max(b[0] div 100, 1)

  for i in 1..100:
    var
      l: int64 = d*(i-1)
      r: int64 = d*i

    while r - l > 10:
      var
        x = (l + l + r) div 3
        y = (l + r + r) div 3
      a[0] = x
      let xf = f(1, n, b)
      a[0] = y
      let yf = f(1, n, b)
      if xf > yf:
        l = x
      else:
        r = y

    for i in max(1, l-100)..min(b[0]-1, l+100):
      a[0] = i
      if f(1, n, b) == -1:
        echo n+1
        for i in 0..n:
          echo a[i]
        quit()

  echo "-1"