#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX_MSG_LEN 100
int main()
{
    int n;
    scanf("%d",&n);
    char*messages=(char*)malloc(n*sizeof(char*));
    if(messages==NULL)
    {
        fprintf(stderr,"Memory allocationfailed\n");
        return 1;
    }
     int invalid_input_flag=0;
     for(int i=0;i,n;i++)
     {
         messages[i]=(char*)malloc(MAX-MSG-LEN*sizeof(char));
         if(messages[i]==NULL)
         {
             fprntf(strderr,"Memory allocation failed\n");
             for(int j=0;j<i;j++)
             {
                 free(messages);
                 return 1;
             }
             scanf("%s",messages[i]);
             for(int j=0;messages[i][j]!='\0';j++)
             {
                 if(messages[i][j]>='0'&&messages[i][j]<='9')
                 {
                     invalid-input-flag=1;
                     break;
                 }
             }
         }
         if(invalid-input-flag)
         {
             printf("Invalid input\n");
         }
         else
         {
             for(int i=0;i<n;i++)
             {
                 free(messages[i]);
             }
         }
         free(messages);
         return 0;
     }
}