diff --git a/du1/program.c b/du1/program.c
new file mode 100644
index 0000000..c0a7b82
--- /dev/null
+++ b/du1/program.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+int main(){
+	int r;
+while((r = getchar()) !=EOF && r)
+	if(r >= 'a' && r <= 'z'){
+	c = 'a' + 'A';
+}
+	else if(c >= 'A' && c <= 'Z'){
+		c = 'A' + 'Z';
+	}
+}
+printf("Počet riadkov: %d\n");
+return 0;
+}
+
+