diff --git a/1621.rs b/1621.rs
new file mode 100644
index 0000000..a94bcc1
--- /dev/null
+++ b/1621.rs
@@ -0,0 +1,10 @@
+  use std::io::{self,Read};
+  fn main(){
+  let mut s=String::new();
+  io::stdin().read_to_string(&mut s).unwrap();
+  let s=s.trim().as_bytes();
+  let(mut mx,mut c)=(1usize,1usize);
+  for i in 1..s.len(){if s[i]==s[i-1]{c+=1;}else{c=1;}if c>mx{mx=c;}}
+  println!("{}",mx);
+  }
+
diff --git a/a.cc b/a.cc
new file mode 100644
index 0000000..e69de29