diff --git a/solutions/typescript/line-up/1/line-up.ts b/solutions/typescript/line-up/1/line-up.ts
new file mode 100644
index 0000000..23ae42e
--- /dev/null
+++ b/solutions/typescript/line-up/1/line-up.ts
@@ -0,0 +1,16 @@
+export function format(name: string, number: number): string {
+	let ending = "th";
+	let numberStr = String(number);
+	const modOne = number % 10 === 1;
+	const modTwo = number % 10 === 2;
+	const modThree = number % 10 === 3;
+	if (
+		(modOne || modTwo || modThree) &&
+		numberStr[numberStr.length - 2] !== "1"
+	) {
+		if (modOne) ending = "st";
+		else if (modTwo) ending = "nd";
+		else ending = "rd";
+	}
+	return `${name}, you are the ${number}${ending} customer we serve today. Thank you!`;
+}