diff --git a/a1/output/program.exe b/a1/output/program.exe
deleted file mode 100644
index 1617f2c..0000000
Binary files a/a1/output/program.exe and /dev/null differ
diff --git a/a1/program.c b/a1/program.c
new file mode 100644
index 0000000..4c1317c
--- /dev/null
+++ b/a1/program.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <ctype.h>
+
+void funkcia (int c, int *line_count) {
+    if (c == '\n') {
+        (*line_count)++;
+        putchar(c);
+    } else if (isalpha(c)) {
+        putchar(islower(c) ? toupper(c) : tolower(c));
+    } else if (isprint(c)) {
+        putchar(c);
+    }
+}
+
+int main() {
+    int c;
+    int c2 = 0;
+    while ((c = getchar()) !=EOF) {
+        funkcia(c, &c2);
+    }
+    printf("\nHow many strings: %d\n", c2);
+    return 0;
+}