#![allow(non_snake_case, unused_imports)]

use std::collections::{BinaryHeap, HashMap, HashSet};
use ac_library::{Additive, Min, Segtree};
use proconio::{input, marker::Usize1, marker::Chars};
use itertools::Itertools;

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn main() {
    input! {
        T: [i64; 7],
    }

    let ans = T.iter()
        .scan(6000, |s, &t| {
            let ns = if *s == -1 || t == -1 {
                -1
            } else {
                (*s - t).max(-1)
            };

            *s = ns;
            Some(ns)
        })
        .collect_vec();

    println!("{}", ans.iter().join("\n"));
}