var n = parseInt(readLine());
    var s = readLine();
    var k = parseInt(readLine());
    let finalString = ''
    for (let letter of s) {
      let letra = ''
      if (letter.match(/[a-z]/i)) {
        let asciiL = letter.charCodeAt(0)
        if (asciiL >= 65 && asciiL <= 90) {
          letra = String.fromCharCode(65 + (asciiL - 65 + k) % 26)

        }
        if (asciiL >= 97 && asciiL <= 122) {
          letra = String.fromCharCode(97 + (asciiL - 97 + k) % 26)
        }
      } else {
        letra = letter
      }
      finalString += letra
    }
    console.log(finalString)