diff --git a/code_study/Baekjoon/swift/10987.swift b/code_study/Baekjoon/swift/10987.swift
new file mode 100644
index 0000000..873bf74
--- /dev/null
+++ b/code_study/Baekjoon/swift/10987.swift
@@ -0,0 +1,12 @@
+let letters = readLine()!
+let count = letters.reduce(into: [:]){ counts, letter in counts[letter, default: 0] += 1 }
+
+let s = "aeiou"
+var ans = 0
+for c in s {
+    if let n = count[c] {
+        ans += n
+    }
+}
+
+print(ans)
\ No newline at end of file