#include<stdio.h>
#include<stdlib.h>

int main(int ac,char** av){
	char* buf = 0;
	int capa = 0;
	int used = 0;
	for(;;){
		int c = getchar();
		if( c== -1 ) break;
		if( used +2 > capa ){
			capa = capa + 5;
			buf = (char*)realloc(buf,capa);
			if(buf==0){
				perror("メモリ不足");
				break;
			}
		}
		buf[used]=c;
		buf[used+1]=0;
		used ++;
	}
	if( buf != 0){
		printf("input is %s\n",buf);
	}
	return EXIT_SUCCESS;
}