Language: C

Source code:

#include <stdio.h> int main() { char input[256]; printf("Enter flag to check: "); scanf("%s", input); if (strlen(input) != 12) { printf("Wrong length!\n"); return 0; } if (strcmp(input, "MicCheck_h4w") <= 0) { printf("Wrong check 1!\n"); return 0; } if (strcmp(input, "MicCheck_h4y") >= 0) { printf("Wrong check 2!\n"); return 0; } printf("Yes! Correct flag is %s\n", input); return 0; }

Compiled Linux binary: mc2
Compiled Windows binary: mc2.exe