1 files changed, 5 insertions, 3 deletions
diff --git a/src/io/input.c b/src/io/input.c
index 971ffdf..507bd59 100644
--- a/src/io/input.c
+++ b/src/io/input.c
@@ -32,11 +32,13 @@ static GEN input_i(const char *prompt, unsigned long bits) {
 		free(line);
 		return gen_m1;
 	}
-	for (size_t i = 0, j = 0; (line[j] = line[i]); j += !isspace(line[i++]))
-		;
+	bool sign = line[0] == '-';
 
 	pari_sp ltop = avma;
-	GEN in = strtoi(line);
+	GEN in = strtoi(line + sign);
+	if (sign) {
+		togglesign(in);
+	}
 	free(line);
 
 	// check bitsize here