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

char input[100];
char word[100][50];
int memeCheck[100];
int main() {
	int runner=0,w=0,l=0,nowCount=0,maxCount=0,startRun=0,endRun=0,memeRun=0;
	fgets(input,100,stdin);
	while (input[runner]!=0){
		while(input[runner]!=32){
			if(input[runner]==10) break;
			word[w][l]=input[runner];
			runner++;
			l++;
			word[w][l]=0;
			nowCount++;
		}
		runner++;
		w++;
		l=0;
		if(nowCount>maxCount) maxCount=nowCount;
		nowCount=0;
	}
	for (int i=0;i<w;i++){
		startRun=0;
		memeCheck[i]=1;
		for (int j=0;word[i][j]!=0;j++) endRun=j;
		while(startRun<endRun){
			if(word[i][startRun]!=word[i][endRun]){
				memeCheck[i]=0;
				break;
			}
			startRun++;
			endRun--;
		}
	}
	
	printf("%d\n",w);
	printf("%d\n",maxCount);
	while(memeRun<w){
		if(memeCheck[memeRun]==1) printf("%s ",word[memeRun]);
		memeRun++;
	}
		
	return 0;
}