#include <stdio.h>

void cat(FILE* f) {
  int in;
  while((in = getc(f)) != EOF) {
    putchar(in);
  }
}

int main(int argc, char** argv) {
  if(argc == 1) {
    cat(stdin);
  }
  else {
    for(int i = 1; i < argc; i++) {
      FILE* f = fopen(argv[i], "r");
      cat(f);
      fclose(f);
    }
  }
}