diff --git a/src/ast/src/main.cpp b/src/ast/src/main.cpp
index 380845f..cc464a4 100644
--- a/src/ast/src/main.cpp
+++ b/src/ast/src/main.cpp
@@ -81,7 +81,10 @@ int main(int argc,char *argv[])
 		string file = argv[optind];
 		ifstream fileStream(file, std::ios::in);
 		if(fileStream.is_open()) {
-			// TODO
+            string line;
+            while(getline(fileStream, line)) {
+                inputStr += line + "\n";
+            }
 		} else {
 			cerr << "Cannot open file: " << file;
 			return 1;