diff --git a/2021/day4/src/bingo.rs b/2021/day4/src/bingo.rs
index dd63140..d8ab36d 100644
--- a/2021/day4/src/bingo.rs
+++ b/2021/day4/src/bingo.rs
@@ -3,7 +3,40 @@ pub struct BingoCard {
     grid: Vec<Vec<(u32, bool)>>,
 }
 
+impl BingoCard {
+    pub fn from_input(input: &[&str]) -> Self {
+        let grid = input
+            .iter()
+            .map(|line| {
+                line.replace("  ", " ")
+                    .trim()
+                    .split(' ')
+                    .map(|n| n.parse::<u32>().unwrap())
+                    .map(|n| (n, false))
+                    .collect::<Vec<(u32, bool)>>()
+            })
+            .collect::<Vec<Vec<(u32, bool)>>>();
+
+        BingoCard { grid }
+    }
+}
+
 pub fn parse_bingo_input(input: &str) -> (&str, Vec<BingoCard>) {
+    let lines: Vec<&str> = input.split('\n').collect();
+
+    let (bingo_numbers, cards) = match lines.split_first() {
+        Some((first, rest)) => (first, rest),
+        _ => (&"", &[] as &[&str]),
+    };
+
+    let x = cards
+        .split(|line| line.is_empty())
+        .filter(|line| line.is_empty() == false)
+        .collect::<Vec<&[&str]>>();
+
+    println!("x.len = {:?}", x.len());
+    println!("{:?}", x);
+
     ("", vec![])
 }
 
@@ -12,6 +45,43 @@ mod tests {
 
     use crate::bingo::*;
 
+    #[test]
+    fn construct_empty_bingo_card_from_input() {
+        let input = vec![];
+
+        let actual_bingo_card = BingoCard::from_input(&input);
+
+        let expected_bingo_card = BingoCard { grid: vec![] };
+
+        assert_eq!(actual_bingo_card, expected_bingo_card);
+    }
+
+    #[test]
+    fn construct_bingo_card_from_input() {
+        let input = vec![
+            "22 13 17 11  0",
+            " 8  2 23  4 24",
+            "21  9 14 16  7",
+            " 6 10  3 18  5",
+            " 1 12 20 15 19",
+        ];
+
+        let actual_bingo_card = BingoCard::from_input(&input);
+
+        #[rustfmt::skip]
+        let expected_bingo_card = BingoCard {
+            grid: vec![
+                vec![(22, false),(13, false),(17, false),(11, false),(0, false),],
+                vec![(8, false),(2, false),(23, false),(4, false),(24, false),],
+                vec![(21, false),(9, false),(14, false),(16, false),(7, false),],
+                vec![(6, false),(10, false),(3, false),(18, false),(5, false),],
+                vec![(1, false),(12, false),(20, false),(15, false),(19, false),],
+            ],
+        };
+
+        assert_eq!(actual_bingo_card, expected_bingo_card);
+    }
+
     #[test]
     fn parse_empty_bingo_input() {
         let input = "";