diff --git a/du6/program.c b/du6/program.c
new file mode 100644
index 0000000..087dfca
--- /dev/null
+++ b/du6/program.c
@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#define SIZE 111
+void pr1();
+void pr2();
+void pr3();
+int compare(const void* arg1, const void* arg2){
+    char* s1 = *((char**)arg1);
+    char* s2 = *((char**)arg2);
+    int r = strcmp(s1,s2);
+    return r;
+}
+
+int main(){
+    bool search;
+    int nl;
+    int xox = 0;
+    char* pole[SIZE];
+    memset(pole,0,SIZE*sizeof(char*));
+    nl = 0;
+    scanf("%d", &nl);    
+    while (2==2)
+    { 
+        int pz;
+        char st[SIZE];
+        memset(st,0,SIZE);
+        char* r = fgets(st,SIZE,stdin);
+        pz = 0;
+        if (r!=NULL){
+            pz = strlen(st);
+        }else{
+            break;
+        }
+        search = false;
+        for (int i = 0; i < xox; i++){
+            if (memcmp(pole[i],st,pz) == 0){
+                search = true;
+            }    
+        }
+        search = false;
+        if(search){
+            pole[xox] = calloc(' ',pz + 1);
+            memcpy(pole[xox],st,pz + 1);
+            xox ++;
+        }
+        search = false;
+    }
+    if (nl < 0 || nl == 0){
+        pr1();
+        return 0;
+    }
+    if (xox==1){
+        pr2();
+        return 0;
+    }
+    
+    qsort(pole,xox,sizeof(char*),compare);
+    printf("Prijati studenti:");
+    int i2=0;
+    while (i2 <=nl){
+        i2++;
+        if (pole[i2]!=NULL){
+         printf("%s",pole[i2]);   
+        }
+    }
+    if (nl+1 < xox){
+        pr3(); 
+    }
+    int i3;
+    for (i3=nl+1; i3 < xox; i3++){
+        if (pole[i3]!=NULL)
+        {
+         printf("%s",pole[i3]);   
+        }
+    }
+    int i4;
+    for (i4 = 0; i4 < xox; i4++){
+        free(pole[i4]);
+    }
+}
+void pr1(){
+    printf("Nespravny vstup\n");
+}
+void pr2(){
+    printf("Ziadne prihlasky\n");
+}
+void pr3(){
+    printf("Neprijati studenti:\n");
+}
\ No newline at end of file