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function asciiToStr(asciiStr) {
  var
    srcText = asciiStr,
    arr = srcText.split(' '),
    outText = "",
    i,len;
for (var i = 0, len = arr.length; i < len; i +=1) {
  outText += String.fromCharCode(arr[i]) + ' ';
}
  return outText;
}
console.log(asciiToStr("72 97 112 112 121 32 80 114 111 103 114 97 109 109 101 114 115 32 68 97 121 33"));