diff --git a/main.cpp b/main.cpp
index 78c7967..2a73639 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,21 +13,39 @@ struct Input {
 };
 
 Input
-input_data(istream& in) {
+input_data(istream& in, bool prompt) {
     size_t number_count;
-    in >> number_count;
-    Input inn;
-    inn.numbers.resize(number_count);
-    for (size_t i = 0; i < number_count; i++) {
-        cin >> inn.numbers[i];
+    if (prompt == true){
+        cerr << "input number count";
+        in >> number_count;
+        Input inn;
+        inn.numbers.resize(number_count);
+        cerr << "input numbers";
+        for (size_t i = 0; i < number_count; i++) {
+            cin >> inn.numbers[i];
+        }
+        cerr << "input bin count";
+        in >> inn.bin_count;
+        return inn;
+    }
+    else{
+        cout << "input number count";
+        in >> number_count;
+        Input inn;
+        inn.numbers.resize(number_count);
+        cout << "input numbers";
+        for (size_t i = 0; i < number_count; i++) {
+            cin >> inn.numbers[i];
+        }
+        cerr << "input bin count";
+        in >> inn.bin_count;
+        return inn;
     }
-    in >> inn.bin_count;
-    return inn;
 }
 
 int
 main(){
-    auto in = input_data(cin);
+    auto in = input_data(cin,true);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;