A Groovy script for applying a shift cipher to some text

shiftCipher.groovy

String shiftCipher(String text, int amt = -3) {
    new String(text.toUpperCase().chars.collect { c ->
       c < 33 ? c : (c - 65 + (amt < 0 ? 26 + amt : amt)) % 26 + 65
    } as char[])
}

(-25..25).each { amt -> println "$amt: ${shiftCipher('WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ', amt)}" }