diff --git a/du1/program.c b/du1/program.c
index ea315d7..aceb113 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -2,34 +2,23 @@
 #include <stdlib.h>
 #include <ctype.h>
 int main(){
-int count = 0;
 int c = 0;
+int count = 0;
 int riadok = 0;
-int pop = 0;
 while(c != EOF){
 c = getchar();	
-if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')){
-if (c >= 'a' && c <= 'z' && count == 0){
-c = c - 32;
-printf("%c", c);
-count++;
-riadok++;
-}
-if (c >= 'A' && c <= 'Z' && count == 0){
-c = c + 32;
-printf("%c", c);
-riadok++;
-}
-pop++;
-}
-else{
-if(c != 10 && pop == 0){
+if(islower(c)){
+c = toupper(c);
 printf("%c\n", c);
 riadok++;
+count++;
 }
-}
-pop = 0;
-count = 0; 
+if(isupper(c) && count == 0){
+c = tolower(c);
+printf("%c\n", c);
+riadok++;
+} 
+count = 0;
 }
 printf("\nPočet riadkov: %d\n", riadok);
 return 0;