#include <stdio.h>
#include <stdlib.h>
char v[100][100];
int main()
{
    FILE *fin,*fout;
    char c;
    int n,m,col,lin,clin,ccol;
    fin=fopen("diagonal.in","r");
    fout=fopen("diagonal.out","w");
    lin=0;
    while((c=fgetc(fin))!=EOF){
        v[lin][0]=c;
        c=fgetc(fin);
        col=1;
        while(c!='\n'){
            v[lin][col]=c;
            col++;
            c=fgetc(fin);
        }
        lin++;
    }
    n=lin;
    m=col;
    lin=n-1;
    col=0;
    while((col<m) ||(lin>-1)){
        if(lin==-1){
            lin++;
        }
        clin=lin;
        ccol=col;
        while(ccol<m && clin<n){
            fputc(v[clin][ccol],fout);
            clin++;
            ccol++;
        }
        lin--;
        if(lin==-1){
            col++;
        }
    }
    fprintf(fout,"\n");
    col=0;
    lin=0;
    while((col<m) ||(lin<n)){

        if(col==m){
            col--;
        }
        clin=lin;
        ccol=col;
        while(ccol>-1 && clin<n){
            fputc(v[clin][ccol],fout);
            clin++;
            ccol--;
        }
        col++;
        if(col==m){
            lin++;
        }
    }
    return 0;
}