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#include<stdio.h>
#include<string.h>
#include<ctype.h>
int func(char c[],int size)
{
int i,x;
for(i=0;i<size;i++)
{
if(c[i]!='\0')
{
x=c[i]-'0';
if((atoi(c[i]))==x)
return c[i];
}
else
break;
}
}
int main()
{
char c[100];
int i,s=0;
while((c[i]=getchar())!='\n')
s=s+1;
putchar(func(c,s));
return 0;
}