First non-repeated character in a string

//INPUT: ramukhsemar
//OUTPUT: first non repeated character = u

#include<stdio.h>

char firstnonrep(char c[]){
int l = strlen(c);
int i;
static int a[256];
for(i=0;i<l;i++){
a[c[i]]++;
}
for(i=0;i<l;i++){
if(a[c[i]] == 1){
return c[i];
}
}
}

int main(){
char c[] = "ramukhsemar";
char p = firstnonrep(c);
printf("first non repeated character = %c",p);
return 0;
}