input_array = gets.chars
count = 1

for input in input_array
    if count > 26
        count = 1
    end
    input = input.ord - count
    
    if input < 65
        input = 26 + input
    elsif input > 90
        input = 156 - input
    end
    input = input.chr
    print input
    count += 1
end