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#include <ctype.h>
#include <stdio.h>
#define isbinary(x) (iscntrl(x) && !isspace(x))
#define istext(x) (islower(x) || isupper(x) || (x) > 127)
#define MINTEXT 4
#define FILL_CHARACTER ' '
int
main(void)
{
int mode;
unsigned char old[MINTEXT - 1];
int c;
mode = 0;
while ((c = getchar()) != EOF) {
if (isbinary(c)) {
if (mode == 0) putchar('\n');
mode = MINTEXT;
}
else {
if (mode > 0) {
if (istext(c)) {
mode--;
if (mode == 0) {
int j;
for (j = 0; j < MINTEXT-1; j++)
putchar(old[j]);
putchar(c);
}
else old[MINTEXT - mode - 1] = c;
}
else mode = MINTEXT;
}
else putchar(c);
}
}
if (mode == 0) putchar('\n');
return 0;
}
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