diff --git a/atcoder/abc377/a.rs b/atcoder/abc377/a.rs
new file mode 100644
index 00000000..9943ca51
--- /dev/null
+++ b/atcoder/abc377/a.rs
@@ -0,0 +1,11 @@
+fn getline() -> String {
+    let mut ret = String::new();
+    std::io::stdin().read_line(&mut ret).ok().unwrap();
+    ret
+}
+
+fn main() {
+    let mut s = getline().trim().bytes().collect::<Vec<_>>();
+    s.sort();
+    println!("{}", if s == b"ABC" { "Yes" } else { "No" });
+}
diff --git a/atcoder/abc377/b.rs b/atcoder/abc377/b.rs
new file mode 100644
index 00000000..16b60b75
--- /dev/null
+++ b/atcoder/abc377/b.rs
@@ -0,0 +1,34 @@
+fn getline() -> String {
+    let mut ret = String::new();
+    std::io::stdin().read_line(&mut ret).ok().unwrap();
+    ret
+}
+
+fn main() {
+    let mut b = vec![vec![]; 8];
+    for i in 0..8 {
+        let s = getline().chars().collect::<Vec<_>>();
+        b[i] = s;
+    }
+    let mut ans = 0;
+    for i in 0..8 {
+        for j in 0..8 {
+            if b[i][j] == '#' {
+                for a in 0..8 {
+                    if b[a][j] != '#' {
+                         b[a][j] = 'x';
+                    }
+                }
+                for a in 0..8 {
+                    if b[i][a] != '#' {
+                         b[i][a] = 'x';
+                    }
+                }
+            }
+        }
+    }
+    for i in 0..8 {
+        ans += b[i].iter().filter(|&&c| c == '.').count();
+    }
+    println!("{}", ans);
+}
diff --git a/atcoder/abc377/remain.txt b/atcoder/abc377/remain.txt
new file mode 100644
index 00000000..3a91954e
--- /dev/null
+++ b/atcoder/abc377/remain.txt
@@ -0,0 +1,5 @@
+c
+d
+e
+f
+g