diff --git a/04/solution.c b/04/solution.c
index 88dab3d..b21c53a 100644
--- a/04/solution.c
+++ b/04/solution.c
@@ -1,9 +1,15 @@
 #include <stdio.h>
+#include <ctype.h>
 
 int main(void) {
     int a, b, c, d, S = 0, G = 0;
+    char l[64], *e;
 
-    while (scanf("%u-%u,%u-%u", &a, &b, &c, &d) == 4) {
+    while (fgets(l, 64, stdin)) {
+        a = b = c = d = 0;
+        e = l;
+#define rdec(V) { while (isdigit(*e)) V = 10 * V + (*e++ - '0'); e++; }
+        rdec(a) rdec(b) rdec(c) rdec(d)
         S += (a >= c && b <= d) || (c >= a && d <= b);
         G += (a <= c && b >= c) || (c <= a && d >= a);
     }