#include <stdio.h>
int main() {
char a,b;
int k,c,m;
char x[100000];
scanf("%c %c %d",&a,&b,&c);
m=a;
for(int j=a;j<=b;j++)
{
x[j]=j;
}
for(k=1;k<c;k++,m++)
{
x[k+b]=x[m];
}
for(int i=a+k-1;i<b+k;i++)
{
printf("%c",x[i]);
}
}
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