diff --git a/cv1/program.c b/cv1/program.c
index bd2350f..1ee33bb 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -13,22 +13,23 @@ struct pizza {
 
 char hacker_script(char l) {
     switch (l) {
-        case 'o': return '0';
-        case 'i': return '1';
-        case 'z': return '2';
-        case 'e': return '3';
-        case 'a': return '4';
-        case 's': return '5';
-        case 'b': return '6';
-        case 't': return '7';
-        case 'q': return '9';
-        default: return tolower(l);
+        case '0': return 'o';
+        case '1': return 'i';
+        case '2': return 'z';
+        case '3': return 'e';
+        case '4': return 'a';
+        case '5': return 's';
+        case '6': return 'b';
+        case '7': return 't';
+        case '8': return 'b';
+        case '9': return 'q';
+        default: return l;
     }
 }
 
 void transform_to_hacker_script(const char *src, char *dest) {
     while (*src) {
-        *dest++ = hacker_script(tolower(*src++));
+        *dest++ = hacker_script(*src++);
     }
     *dest = '\0';
 }