#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char name[100];
    fgets(name,sizeof(name),stdin);
    name[strcspn(name,"\n")]= '\0';
    int len = strlen(name);
    if(len == 0){
        printf("Invalid Input");
        return 0;
    }
    for(int i = 0;i < len;i++){
        if(isdigit(name[i])) {
            printf("Invalid input");
            return 0;
        }
    }
    for(int row = 1;row <= len;row++){
        for(int s =0;s < (lem - row);s++){   
            printf(" ");
        }
        for(int j = 0;j < row;j++){
            printf("%c",name[j]);
            printf(" ");
            }
            printf("\n"); 
        }
        return 0;
}