use std::io::Write;

fn main() {
    input! {
        n: usize,
        a: usize,
        b: usize,
        c: usize,
    }
    let mut s = vec![vec![0; n]; n];
    let mut a = a;
    let mut b = b;
    let mut c = c;
    let odd = n * n / 2;
    let even = n * n - odd;
    if a <= even && c <= odd {
        for (i, s) in s.iter_mut().enumerate() {
            for (j, s) in s.iter_mut().enumerate() {
                if (i + j) % 2 == 0 && a > 0 {
                    *s = 1;
                    a -= 1;
                } else if (i + j) % 2 == 1 && c > 0 {
                    *s = 3;
                    c -= 1;
                } else {
                    *s = 2;
                }
            }
        }
    } else if c <= even && a <= odd {
        for (i, s) in s.iter_mut().enumerate() {
            for (j, s) in s.iter_mut().enumerate() {
                if (i + j) % 2 == 0 && c > 0 {
                    *s = 3;
                    c -= 1;
                } else if (i + j) % 2 == 1 && a > 0 {
                    *s = 1;
                    a -= 1;
                } else {
                    *s = 2;
                }
            }
        }
    } else if a + b <= even {
        for (i, s) in s.iter_mut().enumerate() {
            for (j, s) in s.iter_mut().enumerate() {
                if (i + j) % 2 == 0 && a > 0 {
                    *s = 1;
                    a -= 1;
                } else if (i + j) % 2 == 0 && b > 0 {
                    *s = 2;
                    b -= 1;
                } else {
                    *s = 3;
                }
            }
        }
    } else {
        for (i, s) in s.iter_mut().enumerate() {
            for (j, s) in s.iter_mut().enumerate() {
                if (i + j) % 2 == 0 && c > 0 {
                    *s = 3;
                    c -= 1;
                } else if (i + j) % 2 == 0 && b > 0 {
                    *s = 2;
                    b -= 1;
                } else {
                    *s = 1;
                }
            }
        }
    }
    for s in s.iter() {
        use util::*;
        println!("{}", s.iter().join(""));
    }
}

/*

N>=6
小大小とならべればok
N=2
12
31

22
13

N=3,4,5
1,3が1/3超えるならそれを真ん中におく
2しか超えないなら

いや1,3 をparityが異なる箇所におく
片方について過半数より大きい場合
1,2 をparityが等しいところにおく

*/

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------
mod util {
    pub trait Join {
        fn join(self, sep: &str) -> String;
    }

    impl<T, I> Join for I
    where
        I: Iterator<Item = T>,
        T: std::fmt::Display,
    {
        fn join(self, sep: &str) -> String {
            let mut s = String::new();
            use std::fmt::*;
            for (i, v) in self.enumerate() {
                if i > 0 {
                    write!(&mut s, "{}", sep).ok();
                }
                write!(&mut s, "{}", v).ok();
            }
            s
        }
    }
}