diff --git a/Postman_Sort/Postman_Sort.dart b/Postman_Sort/Postman_Sort.dart
new file mode 100644
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+++ b/Postman_Sort/Postman_Sort.dart
@@ -0,0 +1,99 @@
+// Importing required libraries
+import 'dart:io';
+import 'dart:math';
+
+// Declaring required variables
+int temp, max, count, maxdigits = 0, c = 0;
+int t1, t, i, j;
+List array, array1;
+int n = 1;
+  
+// Method to arrange numbers that have same base
+void arrange(int k, int n){
+    for(int i = k; i < n - 1; i ++){
+        for(int j = i + 1; j < n; j ++){
+            if(array1[i] > array1[j]){
+                temp = array1[i];
+                array1[i] = array1[j];
+                array1[j] = temp;
+                temp = array[i]%10;
+                array[i] = array[j]%10;
+                array[j] = temp;
+            }
+        }
+    }
+}
+
+
+void main(){
+
+    // Input of the size of the array
+    print("Enter the number of elements in the array:");
+    var input = stdin.readLineSync();
+    count = int.parse(input);
+
+    // Input of array elements
+    print("Enter the array elements:");
+    input = stdin.readLineSync();
+    var lis = input.split(' ');
+    array = lis.map(int.parse).toList();
+    array1 = lis.map(int.parse).toList();
+
+    // Finding the maximum possible length of the numbers in the array
+    for(i = 0; i < count; i ++){
+        t = array[i];
+        c = (log(array[i])/log(10)).floor();
+        if(c > maxdigits){
+            maxdigits = c;
+        }
+    }
+
+    for(i = 0; i < maxdigits - 1; i ++){
+        n = n * 10;
+    }
+
+    for(i = 0; i < count; i ++){
+        max = (array[i]/n).floor();
+        t = i;
+        for(j = i + 1; j < count; j ++){
+            if(max > (array[j]/n).floor()){
+                max = (array[j]/n).floor();
+                t = j;
+            }
+        }
+
+        // Swapping
+        temp = array1[t];
+        array1[t] = array1[i];
+        array1[i] = temp;
+        temp = array[t];
+        array[t] = array[i];
+        array[i] = temp;
+    }
+
+    while(n >= 1){
+        for(i = 0; i < count;){
+            t1 = (array[i]/n).floor();
+            for(j = i + 1; j < count && t1 == (array[j]/n).floor(); j ++){
+                arrange(i, j);
+            }
+            i = j;
+        }
+        n = (n / 10).floor();
+    }
+
+    print("The sorted array is:");
+    print(array.join(" "));
+}
+
+/**
+ *  Sample Input and Output
+ * ----------------------------
+ * Enter the number of elements in the array:
+ * 10
+ * Enter the array elements:
+ * 10 9 8 7 6 5 4 3 2 1
+ * The sorted array is:
+ * 1 2 3 4 5 6 7 8 9 10
+ * 
+ */