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#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
/* Get string from stdin */
void readline(FILE *in, char *p) {
int c;
while (true) {
c = fgetc(in);
if (c == EOF || c == '\n')
break;
*p++ = c;
}
*p = '\0';
}
void echo(FILE *in) {
char buf[48];
readline(in, buf);
puts(buf);
}
int main(int argc, char *argv[]) {
FILE *in = NULL;
if (argc == 2)
in = fopen(argv[1], "rb");
if (in == NULL)
in = stdin;
echo(in);
return 0;
}
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