Update main.v

main.v

@@ -1,5 +1,22 @@
 module main
 
-fn main() {
+import os
-	println('Hello World!')
+
+fn read_stdin() string {
+	  mut line := ''
+	  mut inputstr := ''
+	  for {
+		    line = os.get_line()
+		    if line.len == 0 && os.stdin().eof() {
+			      break
+		    }
+		    line = line.trim_space()
+		    inputstr += line
+	  }
+	  return inputstr
+}
+
+fn main() {
+	  var := read_stdin()
+	  println(var)
 }