Bulls and cows: Difference between revisions

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@@ Line 692: / Line 692: @@
 <lang d>void main() {
     import std.stdio, std.random, std.string, std.algorithm,
-           std.range, std.conv;
+           std.range, std.conv, std.ascii;
     immutable hidden = "123456789"d.randomCover.take(4).array;
@@ Line 698: / Line 698: @@
         "Next guess: ".write;
         immutable d = readln.strip.dtext;
-        if (d.length == 4 && d.countchars("1-9") == 4 &&
+        if (d.count == 4 && d.all!isDigit &&
             d.dup.sort().uniq.count == 4) {
             immutable bulls = d.zip(hidden).count!(p => p[0] == p[1]);