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diff --git a/challenge-056/cristian-heredia/perl/ch-1.pl b/challenge-056/cristian-heredia/perl/ch-1.pl
new file mode 100644
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+++ b/challenge-056/cristian-heredia/perl/ch-1.pl
@@ -0,0 +1,123 @@
+use strict;
+use warnings;
+use Data::Dumper;
+
+
+#Diff-K
+#You are given an array @N of positive integers (sorted) and another non negative integer k.
+#Write a script to find if there exists 2 indices i and j such that A[i] - A[j] = k and i != j.
+#It should print the pairs of indices, if any such pairs exist.
+#
+#Example:
+#    @N = (2, 7, 9)
+#    $k = 2
+#Output : 2,1#
+
+my @array;
+my $k;
+
+my @sortedArray;
+my $length;
+my $subtraction;
+my $results = '';
+my $number;
+my $continue = 'N';
+
+
+print "Please, provide a number for the array:\n";
+obtainNumber();
+requestArray();
+
+sub requestArray {
+    
+    if ($number =~ /^\d+$/ ) {
+        if ($continue ne 'Y') {
+            push @array, $number;
+        }
+        print "Please provide another number\n";
+        obtainNumber();
+        
+        if ($number =~ /^\d+$/) {
+            push @array, $number;
+            print "Do you want to continue introducing more numbers? Yes (Y) or No (N)\n";
+            $continue = <>;
+            $continue =~ s/^\s+|\s+$//g;
+            
+            if ($continue eq 'Y') {
+                requestArray();
+            }
+            else {
+                requestK();
+            }
+        }
+        else {
+            print "That's no correct, please provide another number.\n";
+            obtainNumber();
+            requestArray();
+        }
+    }
+    else {
+        print "That's no correct, please provide another number.\n";
+        obtainNumber();
+        requestArray();
+    }
+}
+
+sub obtainNumber {
+    
+    $number = <>;
+    $number =~ s/^\s+|\s+$//g;
+}
+
+sub requestK {
+    
+    print "Please provide a number for the comparison.\n";
+    obtainNumber();
+    if ($number =~ /^\d+$/) {
+        $k = $number;
+        sortArray();
+    }
+    else {
+       print "That's no correct, please provide another number.\n";
+       requestK(); 
+    }
+}
+
+sub sortArray {
+    
+    @sortedArray = sort { $a <=> $b } @array;
+    checkConditions();
+}
+
+
+sub checkConditions {
+    
+    $length = @sortedArray;
+    foreach (my $i = 0; $i < $length; $i++) {
+
+        foreach (my $j = 0; $j < $length; $j++) {
+
+            if ($i != $j) {
+                
+                $subtraction = $sortedArray[$i] - $sortedArray[$j];
+
+                if ($subtraction == $k) {
+                    
+                    $results = $results."$i, $j\n";
+                }
+            }
+        }
+    }
+    printMessage();
+}
+
+
+sub printMessage {
+    
+    if ($results ne '') {
+        print "The pairs of indices that meet that conditions are:\n$results";
+    }
+    else {
+        print "There is not any indices that meet that conditions.\n";
+    }
+}