ABC 048, finished all with help of editorial

atcoder/beginner_contests/abc048/src/bin/a.rs

@@ -0,0 +1,11 @@
+use proconio::input;
+
+fn main(){
+    input!{
+        _atcoder: String,
+        s: String,
+        _contest: String,
+    };
+
+    println!("A{}C", s.chars().next().unwrap());
+}