str = gets.chomp

status = 0
uns = ""
num = 0
str.each_char do |ch|
    case status
    when 0 then
        if ch == "@"
            status = 1
        else
            uns += ch
        end
    when 1 then
        num = ch.to_i
        status = 2
    when 2 then
        num.times {uns += ch}
        status = 0
    end
end

puts uns

