var memory = ARGV.map{.to_i};
var ip = 0;

while (ip.ge(0) && ip.lt(memory.len)) {
    var (a, b, c) = memory[ip, ip+1, ip+2];
    ip += 3;
    if (a < 0) {
        memory[b] = STDIN.getc.ord;
    }
    elsif (b < 0) {
        print memory[a].chr;
    }
    elsif ((memory[b] -= memory[a]) <= 0) {
        ip = c
    }
}