#include<stdio.h>
#include<string.h>
int main ()
{
int k, m, n, cont, oi, meu=0, chapa=0;
scanf ("%d%d%d",&k
, &m
, &n
); char p[k+1], p2[m+1], a, b;
for (cont=0;cont<n;cont++)
{
for(oi=0;oi<m;oi++)
{
if (p2[oi]==b)
{
p2[oi]=a;
}
}
}
for (cont=0;cont<k;cont++)
{
for (oi=0;oi<m;oi++)
{
if (p2[oi]==p[cont])
chapa++;
}
}
}
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